Going to be a rare bird, hope someone finds one for you.
But, in 37 years of towing RVs, no one has ever mentioned, let alone wanted to measure my rig before entering.
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