Your towing capacity means diddly squat. What's the payload on that truck? You'll find it on the sticker attached to your drivers door in the sill. Should say cargo carrying capacity.
Mind you that weight is without passengers or cargo. It does account for a full fuel tank.
Take your weight, and the weight of any other passengers, your weight distribution hitch (some are well over 100 lbs) plus any tools/cargo you have in the truck, and subtract it from that cargo capacity.
Now you have what is left for tongue weight on a trailer. The thing to consider is that tongue weight on a travel trailer is going to be, generally, 10-12% of total loaded weight for the trailer. So if the trailer is 7000 lbs loaded, with everything in it, the tongue weight is going to be 700-840 lbs.
Knowing that it's a Laramie with a low payload (1300-1500 lbs) I would say limit yourself to a travel trailer that is 5000-6000 lbs unloaded and no longer than 27 feet.