Can I attach a bumper hitch and bike rack on my rockwood mini lite 1906?

Some help here but finding RV Manuals is never easy. Maker or dealers are the best bet.

https://www.google.com/search?q=2009+Rockwood+signature+ultra+lite+model+8285WS+manual

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Well if you have a electric tester they sale up at harbor freight cheap
Find out if it is getting power or not first then re try sounds like the Motors
Shot or shorted out or froze up.

is the water supply connected to a pressure feed water source.
if so remove water into unit.

Well, as you probably already know Forest River only carries the on-line manuals for the last three model years. So, if your Rockwood is a 2014-2016 model year you can go straight to the web-site. Older models are out of luck, however, I'd send them an email request and see if they can dig one up out of their archives.
Another good place to try would be owners group forums.

I would go with the manufacturer Forest River RV Contact Us Forest River Inc

Look behind all cupboard doors higher and lower. Also look for a brown plastic cover in face of cupboards as well. Usually closer to where power cord enters from outside.

You may be able to climb in through the front storage compartment and raise the bed. Or, some mobile RV repair techs have a master set of keys and can let you in for a nominal fee. If you happen to know what the key number is then you can purchase a replacement key. FIC and Global keys each have 51 different cuts of keys. FIC will have a key code of HF or CF 3** and Global will have G3**.

Coax or RCA? Coax will screw directly to the terminal on the back of the TV. rca connectors will be red to red, white to white (both audio control) and the yellow will go to yellow or in some cases green. The TV should be labeled video in.