No hot water flow through faucets

A pump problem then, not a city water issue.

There should be plugs underneath the camper to drain the water tanks. Remove them and let the water drain. There should also be a plug on the water heater, remove and let water drain. There is also a bypass valve on the water heater to divert water away from the heater, turn this to bypass. After the water has drained replace the plugs except the water heater plug. The heater plug can stay out. Fill fresh water tank with RV antifreeze, usually about 3 gallons or maybe a little more for larger RVs. Run pump opening faucets one by one till water is forced out and the antifreeze flows including toilet. When antifreeze is flowing out the faucets close faucets and shut off pump. When pump is shut off open faucets, the antifreeze may get slushy in very cold conditions but wont freeze and a little may drip out of the faucets. The water heater may still have a small amount of water in it but shouldn't be a problem if you leave the plug out. Make sure the blackwater and greywater tanks are empty, you can dump a little antifreeze down the drains and toilet to make sure the sink traps are free from water and the blackwater tank has antifreeze in it. Other than that just shut the propane tanks off and youre done. Try to leave a couple of windows cracked slightly to promote airflow and reduce condensation inside the camper

Greetings and good health to you.
Ok, so I'm guessing by low you mean quantity and not temp, correct?
Does the cold water sputter as well? If so, most likely bad pump but we'll go with it just being the hot water for now.
Does the hot water act the same way on the other sink faucets? If not, the hot water is flowing freely without sputter, the problem will most likely be in the tub's hot water valve (knob) or the shower attachment. You can replace these rather easily.
If your hot water is low in quantity and sputtering only on the hot, then your hot water tank is not getting enough water to it which will cause it to be "low" and sputter as there isn't any water in there to pull from. If this is the case, we need to figure out what is causing the hot water tank to not have water in it.
Your pump is obviously working as you are only having issues with the hot water. Since using the hot water would normally use what hot water is sitting in the tank and thus pull in fresh water to heat up as the hot water exits. This would be the case if you are using the on board water storage and not hooked up to a hose for your water supply.
So, if this is the case, we need to find out where/why the water is not drawing in from the water storage to the hot water tank. First off, locate both tanks and make sure there isn't a valve on the water line that may be turned off or almost off. Check those water lines for any breakage or leaks. If not, if there are two lines coming out of the water storage, one for the cold and the other for the hot, see if you can notice anything in the water tank that may be blocking the "hot" line.
If all that is well, lets look at the water heater itself. I'm guess you would have noticed if this was leaking which is why I waited until now to bring it up. If you go outside and open the panel, does it look like it could have been leaking? Look at the plug (this is where your heating element is located) at the bottom center of the tank. Does it feel damp or can you see streaks going down from there? If unsure, hook up your hose to the water intake and turn it on. Watch the tank from the outside and see if it starts leaking. If it does, bad plug (heating element) easy and cheap to replace.
Once you see there is no leaking coming from the hot water tank, lets take out the heating element to make sure it is filling up. First shut off the water flow. You'll need a large adjustable wrench or if you happen to have that big of a socket, go for it. Remove the element. Water should start coming out as you unscrew it. Once you remove the element, water should flow freely out until empty.
Now, with the plug out, turn the water back on and see if it flows out of the tank. This will show flow is good up to this point.
Ok, so if there are no leaks thus far and the hot water tank is filling up when you hook up a hose, then we need to look and the connection line going from the tank to the rest of the faucets. Put the plug back in. Turn the water on again and follow the lines from the tank to the faucets looking for leaks.
Once you do all this, you should have an idea of what is happening where and possibly how to fix it.
Let me know how it turns out.

Check by-pass valve(s) position on back of tank.

You should be able to see the pilot light when it is dark outside. Even when it is not dark outside, you can probably see it if you peer inside, but you should also be able to hear it if you are in a quiet area. You can find the pilot light by looking at the heater and identifying the gas pipes: they are typically a little corroded and have valves on them. Just follow the gas pipe into the murky depths of the heater and look around for the blue flame. Sometimes you'll see a thin-diameter tube branch off and run in tandem with the main pipe: this conveys gas to the pilot light. Finally, you might have to open a little aluminum cover and peer inside. If you don't see a flame, you can probably identify about where it ought to be because you will see the main burners. Of course, the pilot light should be right next to the main burners and if you don't see/hear/feel heat there, your pilot is out.

Most class a mtorhomes have water valves in your water fill bay that have controls for all faucets. There is separate one for hot and cold.
the hot would be turned off for storage to allow you to drain the hot water heater for storage.
there may be hot water valve for all faucets or one valvefor each faucet.

Connect the trailer to the city water supply, turn on the water and open each faucet until clean clear water is present. Don't forget the toilet and outside shower if equipped. Next reinstall the anode rod (suburban) or drain plug (atwood) into the water heater. Go to the back side of the water heater and close the valve on the pipe that connects the cold (bottom line into water heater) and hot (upper line out of the water heater) and then open the bottom cold water line valve and, if equipped, the upper hot water valve. This will fill the water heater. Open the hot water valve at the kitchen faucet. When the water flow is steady the water heater is full and ready for use. If the unit is equipped with a water filer, after all is flushed out, turn the water off and remove the filter housing. Install a new filter and re-secure the housing and turn the water back on. If you are using the fresh water pump, it is possible that the winterizing valve for the pump was left open. If so, close that valve which will divert the pump back to drawing from the tank.

Water heater must be FULL of water first. Be sure to bleed all air out of hot water lines all throughout the unit. Check water in heater by purging the PT valve at the top. (The one with the little lever). If no water comes out, there is no water in the heater. You can't heat water is there's none in it to heat!

It is possible that there is an open valve on the back of the water heater which is allowing the hot and cold to mix. Locate the back of the water heater. You will see a water line going into the bottom of the water heater. That is cold water in and there will be a valve on that line. It should be open (The handle inline with the direction of the pipe). At the tope there will be another pipe coming out. That is the hot water out. It may or may not have a valve but if it does make sure that it is open. Then there will be a water line connecting the top and bottom water lines and it will have a valve in it. Make sure that the valve in this line is closed. That is a winterizing bypass valve. If this does not correct the problem let me know and I will give you more steps to consider.

check to see if setiment has settled on the pilot....blow it out with air if it has. This issue comes up often with water heaters and rv refers. If that is not the problem and the pilot remains lit, but never increases when the thermostat is turned up, you probably need a new gas valve/thermostat.