There have been many postings on heights.
The bar between motorhome and toad should be as level as possible and not more than 4 inches either way if not level.
Use a drop receiver to level.
I almost lost my toad on the NY thruway last year because base-plate was hanging by one tread on an all but stripped bolt. The toad would have stopped, break-away on Brake Buddy, but I don't think those behind it could have avoided hitting it.
When you stop and think , WHY LEVEL??
When your braking moho, the nose dives and the rear lifts...-- the toad front dives, the moho lifts and WOW, are we stretching fittings?? No, they give.
Hope this info helps.
--- AIME=== AJBJRVERS----