Ya know Tino643, I think renting a F-250 for that many miles will cost more than having Colonial install your ProPride. I understand you are a perfectionists. The ProPride is straight forward in its installation. Colonial will do just fine. I can even do it!
Then you can pull your new Airstream home with your Grand Cherokee.
Get 'em to throw in a Equalizer, take it back home and install your PP yourself. Sell the Equalizer online and get some money back. If Colonial can't install the PP hitch then who can. You are worrying too much.