When I shipped my first trailer, I met the tractor trailer at a mall. The buyer arranged to have a flat bed tow truck there(a larger size)...they pulled the the camper on the flat bed, then backed up to the tractor trailer and rolled it on....tied it down and off to Canada it went.
Good luck with the sale...better luck with the Mrs...prayers inbound!! (been dealing with cancer for almost 5 years now...had 3 months to live originally...if you need to talk shoot me a DM)