Is this RV to long in the back to launch 24’ boat.

not sure how the rear end being farther back than the wheels has anything to do with dunking? the hitch will be proud of the rear end regardless. the problem I see is with the potential to high center if the wheel spacing is too far or the ramp too steep. either way this would suck. a lot. could likely work on most ramps though not all. by the same definitions there are some ramps that don't work with a lot of vehicles including off the lot pickup trucks. pick your ramp and have fun.