My dad, bless his heart, hauled horses in the back of a Fird F100 with a inline 6 and a "3 on the tree" tyranny.....way more miles than I care to remember!
THEN.......he bought a 1/2 ton Dodge pickup ..... and put a half cab over camper on it!
I drove it several miles as it rocked and rolled down the highway!

That rig was in a strain from the time you cranked it until you parked it!
When it came MY turn to purchase vehicles that would pull or haul, I started out with a 3/4 ton Chevy with a 350 cid and a 3 speed standard. It was geared 4:10! It wouldn't get 10 mpg if you put it in neutral and coasted! LOL!
Last purchase was a 1 ton w/Cummins diesel and a 6 spd std.
I've pulled some pretty amazing loads with that Dodge!
I can't tell you just how many times I've seen a 1/2 ton F150 pulling a huge gooseneck travel trailer.
Either purchase the vehicle and an appropriately sized travel trailer....OR.....purchase a travel trailer and get a vehicle with enough "oomph" to pull it!