this is just my opinion so take it for what its worth of course. Being a pressure pipe welder..... IBEAM shouldnt be used on these campers, MAYBE on the "light" models. The frame under my 2013 laredo is a complete joke and frankly i am just waiting for it to fail, but what does a guy do? not upgrade?. If you guys want to talk beefy, look under a triple E topaz canadian built camper now that is a beefy frame! when we pulled our topaz or backing in on un even ground you hear almost zero groaning/creeks. Pulling the laredo i feel as though all our kitchen cupboards will be ripped out of the walls when we back her around a corner or into a site. If i was making an RV frame it would be either 8 or 10" x 2"x 1/8" square tubing with all ends capped, 3 x 1-1/2" crossmembers. Iam not sure if these companies are trying to make these campers so much lighter to attract more people to buy with smaller trucks, OR just to save money on building materials, or both? as far as iam concerned if your into camping and require a camper of certain credentials you have to pay to play, buy the truck to suit. If your pulling a 30-35' camper dont expect your half ton to pull it! I always get funny looks when my wife and i go to look at campers seriously, and the salesmen wonders why the first thing i do is crawl under the camper to look at the frame!