You need to consider a few other things.
Tow ratings are based on GCWR (trailer and truck) loaded less weight of empty truck (no cargo, 150lb driver, 1/2 tank of gas).
So if your truck has a GVWR of 7000 lbs and weights 5400lbs you can carry 1600lbs in the truck (people, pets, hitch, toungue weight, cargo).
Since you want ~10% of the loaded trailer weight on the tongue you'll have about 1100 lbs (or less) for you, wife, kids, dog, cargo...it can go fast.
Now if you can tow 4500 you prolly have a GCWR of 10,200 or there abouts. This assumes 150lb in the truck...me, wife, 2 kids, dog are over 600lbs and the kids keep growing...YMMV of course but that 'extra' 450lbs reduces the towing weight 450lbs.
And certain truck options can reduce it too (read your owners manual, check your options, get your truck weighed)
So that 5700 drops to 5200, allow 1200lbs of cargo/hitch/propane, etc and you should be looking at a trailer with a yellow weight of ~4000.
Been there done that...and others will tell you the truck can handle more. I'm sure it can...BUT...you can kick a soccer ball,right? OK, do that with a 100lb person riding on your shoulders and it's no fun at all trying to kick that ball and not fall down.
Towing over your trucks limits is gonna be like that - no fun, uncomfortable, hard on the truck and on your nerves.
Originally Posted by scool191
I am so confused by all of this.
I am looking to buy a new travel trailer. I drive a 2011 Ford F150 Supercrew V6 3.73. Per Ford the max tow weight is 5700 pounds.
The trailers I'm looking at have a unloaded weight of 4500 pounds. They very in Grvw from 5800-6800.
So can I get these trailers based on UVW? Or should I look at GRVW.