I've helped in repairing cracked filon sided rvs with slideouts that have fallen out of square , what i learned was ,
one major thing that causes these problems is leveling an rv by using a frame that's too light and not the rv suspension.
I also don't like the idea because,
* road dirt and grime can cause recurring failures due to binding of the tube due to dirt being kicked up from the TV.
* 4 motors that can fail.
* TT frames that are too light can crack and split apart.
When TT's are leveled this way, the entire box (living area) tweaks . The stress on the living area framework of the TT may very well be compromised.
Keep an eye out for potential leaking around windows and all seams , including the roof. If your TT has slides, i would be very concerned doing this. If your TT has a filon exterior, you may find the filon develop large cracks at the corners.
IMO, it's easy enough as well as less stressful to use the TT suspension to support the weight .
Placing a piece of wood under the tire to level it and certainly less expensive and you do not have to worry about all the other negative aspects.