in my net search i'm surprised I didn't see a single dinghy on the cargo carriers I did see a few vertical kayacs on back of RVs.
here's my dinghy
http://www.abinflatables.com/boats/ventus-8-vl/
Overall length
8' 6" / 2,60m
Overall Beam
5' 6" / 1,68m
I never mearsured the last express conversion van it was around 9' because the main vessel is like 11.5' tall.
bumpy using a trailer would make the trip a none quickie. because every time I hook the big boats trailer up the lights don't work so I spend a couple hours straightening out the lights.plus if I choice to stay in a hotel in Florida they don't allow trailers.
as for the dinghy being vertical above the top of roof isn't that the same amount of wind resistance if the dinghy was on the roof?
on land I wish I had the none fiberglass ribbed hull like the boat in the bag.on water you need a solid floor.
is it possible to upload images from my PC here?
