George, so glad to hear that you are up and around again. Does your Honda have a stick shift or the CVT? Just curious.
Your chosen tow vehicle brings to mind our 1985 vacation. My wife, 2 children and I traveled from MI to CO and back, towing a 13' UHaul (fiberglass egg trailer) with a stick shift, 2.2L Dodge Omni. I did have a hard time maintaining 50 mph on modest hills, but I think your Fit has about 1/3 more HP than that Omni. Just one thing I'd advise: check your hitch mount bolts every so often to make sure they're staying tight and not tearing any sheet metal.