If you're going to stick with the TB, get nothing that has a GVWR over 4000#. My old Kiwi 17a had a GVWR of 3500# and as I said above, my Trailblazer was wonderful for towing that trailer.
When I first got my X20E I towed it home empty, which was the shipped weight that was under 4000#. Again, towed beautifully. It wasn't until we stocked it to camp that it became a marginal towing experience.
2013 Jayco Jayfeather X20 E, 2008 GMC Sierra 1500 Crew Cab Z71 SLE