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That is how turbochargers's work, you need exhaust pressure to make boost, so they have what we call "turbo lag" until the pressure is present, that takes RPM's so you have no issue here as far as the turbo goes..
check that the variable blades in the turbine housing are free to move with the actuator working correctly. These move to direct the exhaust gas onto the turbine wheel at low engine RPM to reduce the lag time for a turbo to respond. If they are stuck or the actuator is not working (hard leaking vacuum hose) then it will not allow quick response at low speeds
A shift kit is always a good idea when hauling a trailer. It is a kit that is installed in the transmission made up of gaskets seals and other small parts. Fairly easy to install. This makes the car shift faster, without lag in between gears. Normally if you had a tachometer your car may drop 1200 RPM'S while shifting, but with a shift kit, it would only drop 600 or so RPM"S Easier on fuel, and easier on transmission. Good investment in my opinion. Happy travels and cheers from Nova Scotia
Putting a r/v cam in sometimes will help a bit. An r/v cam will not really give you more HP, but will move the torque curve of your engine to a more usable rpm range. Believe it or not, most of the gain you will see isn't from the cam but is from changing the timing chain which in a high mile engine is likely worn. Most engines benefit from advancing the cam a few degrees (they actually sell kits for doing that) when installing. As a chain wears, it actually retards cam phasing. Changing anything usually is a trade-off. Moving the rpm range of the cam will add low end response but will take away high end performance. If you do not generally run the engine up to 5,000 rpm, you may not notice that though. Changing the intake, adding headers or adding a "performance chip" all have some benefits but never really give you the "advertised" increase. As far as those chips go, they generally work up around 4-5,000 rpm's and don't add much to everyday driving (read: worthless). In reality, the most reliable way to restore lost power in a high mile engine is to do a total rebuild or find a compatible engine with lower miles. There is no "bolt on" cure for internal wear and though the Jeep engine is a tough reliable old bird, they do wear!
Assuming no combustion chamber or fuel delivery faults, most turbo diesel engines exhibits this. The delayed is referred to as turbo lag and the smoke is fuel not completely burned since the fuel system tends to be a little rich when the turbo has not attained boosting RPM. Other than to have your injectors cleaned/replaced, the injector pump re-calibrated and/or the turbo checked for leakage, nothing much could really be done. Alternatives are to use fuel additives, re-check of the computer's map/software and/or change of driving habits. The idea is not to floor the accelerator until the turbo has reached the designated RPM where it kicks in.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.