I have successfully imported 3 campers (2 Bolers and 1 Trillium) from Canada. What I know is that the US purchaser must obtain Form 7501 from US Customs in order to import the camper. For each camper, I have obtained this form at a border crossing, however, its my understanding that the form could also be obtained at another US Customs Border Patrol office, such as an international airport. The purchaser could investigate doing this in Florida.
The US purchaser would also want to secure a bill of sale and signed-over Canadian registration
from you upon purchase.
John in Michigan
EDIT: I don't think that campers brought into the US for personal use can be sold