I have never owned/used a TH, have always wondered about carrying a real vehicle in the back. Aside from whether the frame will handle the weight, another concern to me would be the actual weight distribution and what it would do to the necessary pin weight for stable towing.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired