It all boils down to pin weight and the GVWR and rear axle GAWR. 5th wheels tend to have a pin weight around 20% of the trailer GVWR and travel trailer have a hitch weight of about 10 to 12% of the trailer GVWR.
Problem with a 1/2 ton truck is the lower GVWR. YO load up the fuel, the family and such and the available payload drops and leaves very little for a 5er.
So typically you can practically pull a 5th wheel of about 24'. The so called 1/2 ton towables are generally a joke. Yep you can tow it with a stripped down 1/2 ton truck and only a 150# driver and the trailer is stripped down as well.
Maybe you need to talk to the clown at CanAm, he has people towing 6000# trailers with their Chrysler Mini vans which are rated for 3500#. Maybe he has some magic dust for 5ers as well.
My 2 cents worth.
Ken