I used a gooseneck adapter on my last camper for one season - the camper developed cracks in the fiberglass telling me I was over stressing the frame underneath. The cracks were where the basement stopped an the upper portion (bedroom) started.
I immediately went back to 5th wheel setup.
I wish I still had the pics to provide but it was 5 or 6 years ago.
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3)
2019 Ram 3500 Limited w/ Max Tow pkg