Have never towed a big Travel Trailer or 5th wheel so can not advise.. but .. What are your plans for that 5 year old JEEP? Though I seriously doubt I can afford it at this time.. You might surprise me. PM please if you are interested.
Seriously, What is the loaded weight of the trailer, then what is the tow rating of the vehicles you are considering.. I do know folks who tow with Chevy Silverados, And I tow / towed with Chevys (my Motor home is power by Chevrolet).
Though some tow over the lmit, I like to saty below 80% if I can, (That is if your truck can tow say 5,000 pounds, try to keep the trailer below 4,000) there is some wiggle room on the rating, but it's best to wiggle UNDER.
The Car maker's web site will take you to the truck tow ratings.
Home is where I park it!