Started out with this tiny popup, so small I had to sleep in one side with one kid and the wife in the other with the other kid:
I pulled the popup with an Element for a good 5 years you knew it was back there for sure, in some mountain areas I'd be doing 50 max. We upgraded to a colorado and pulled much better. Then we upgraded to a F-150 4x4, 145 5.0l S-crew 3.55 expecting to buy a hybrid camper in the future and it pulled the popup like it wasn't even back there... took it on a 8 hour trip and didn't lose any gas milage.
Upgraded to a 281qbxl with sway and weight distribution setup:
Just got back from a couple days to test and get familiar with the 281qbxl on a 1.5 hour trip and I went back to knowing it was back there ha... We are plenty under my max for the truck. I don't carry much in the trailer; few dishes, pots and pans, bit of clothes and bedding, couple tools for just in case, tanks are empty, propane full, and just have a couple bikes or kayaks in the truck depending on where we are headed. It went fine, some larger hills I kicked into 4th for a bit, the transmission only hit a max of 202 degrees for a second or two (usually under 196 most of the time) and the winds where pretty high so every now and again I could feel that sway from time to time... Never did over 60. I mostly got nervous on the highway with a lot of traffic when we got into the big city, people love to fly around you don't realize you can't stop on a dime. We'll be taking it to our usual 8 hour drive mid summer and breaking it into 2 days of 4 hour driving but plan on doing some more 1-3 hour trips in it before then to get more accustom to it. Had I known we were going to be buying a trailer not a hybrid I probably would shelled out for the 250 instead (though I LOVE my f150 and would never talk bad about it).
Overall though loving the enclosed trailer much easier to do weekend trips, no more hassle of 3-4 hours of setup.