There is good news and that is the fact you haven't bought the trailer yet! For sure listen to the good folks above educating you on realistic weights to tow behind your truck. They aren't being mean, they are telling you what many of us learned the hard way that towing a trailer that your truck is not rated for is a bad plan.
Spend more time viewing floorplans that have a gvwr below your max for your truck and then decide if you can live with those models. If you want a huge bunkhouse with two doors, several slides etc then a larger truck may be required.