Warranty

If the air conditioner quits - no.
If the frame is bent - probably.

Not to mention that it protrudes 2 or 3 inches below the frame causing the back to hit even sooner and put that much more pressure on the frame. OK, I mentioned it.

I guess you want to add wheels to the rear corners, don't do that. The weight of the trailer will be on a far corner when the wheel hits the road possibly bending the frame or other damage.

Skid wheels are easy to install but I wouldn’t recommend mounting to the TT bumper.

Possibly if it is proved to have directly caused the warranty claim. Put another way it won't affect the warranty on your air conditioning unit