We sold our Frontier because it felt like it was really straining while pulling our Travel Trailer. I upgraded to a full sized GMC with a tow capacity of 7700 lbs (The fronty was 6800 lbs). We have since upgraded our trailer and were seriously looking at 5th wheels when we were shopping around. We could ot find one that I felt could comfortably be towed by our GMC, so I seriously doubt there are many that could be towed by a Frontier. Granted, there are some ultra-light 5ers out there, but how comfortable would you be in it? Especially if you have a family! I would look at Travel Trailers over a fifth wheels. As an example, my truck is rated to tow 7700 lbs, but only rated at 6800 lbs with a 5th wheel or goose neck trailer. It has to do with the weight over the rear axle, not so much the power of the truck!