Just my opinion, but I don't like towing any kind of trailer on dirt roads due to the ST tires. I would rather use an E rated LT tire but you would probably need new wheels due to tire/wheel psi ratings that would have to fit your wheel wells and trailer framework.
I have done it a few times and was lucky afterwards. Rolling down the highway at 65 mph after covering miles of off road travel is not a good idea IMO.
If you venture into the back country with no cell service, i would know how to retract a slideout and retract an electric awning . Know the 'how-to' mechanics of both because you will probably have no help.
A pop-up TC with no slide and aluminum siding would be the unit of choice for ground clearance (holding tanks,dump valves) , low center of gravity, E rated tires to stand up to rocks and the aluminum saves weight, filon is heavier. Its also a lot easier to make a u-turn when you get into a back road 'tight spot' .
If you choose to go ahead with it :
Mods can also be done to any unit.
leaf spring equalizers
shocks
flip the axles , to offer increased ground clearance to offer more protection to the dump valves and holding tanks.