I have a 20' enclosed my car and it measures 16' long at the tip of the wheelie bars. I pull it with my 1/2 ton and I have the weight bar hitch with sway control.
I have no problems pulling mine and it is a flat front end. I put a 2000lb atv winch in it from tractor supply
Always load it with it and un load it as it makes it easy.. I love my 20'.