Rear kitchens = porpoising?

We have had several rear kitchen 5th wheels over the last 28 years and hundreds of thousands of miles traveled with them and never had anything in the kitchen move or break. They are the best floorplan money can buy because of the large counter space it gives and that it keeps all food particles, spills, odors, and dishes in the rear only and also drastically limits people traffic being in the way when cooking etc and eating as it's the end of the trailer with nothing behind it or any exit/entry doors.

Since the salesman has blatantly lied to you about having a 5th wheel trailer with a rear kitchen, don't you wonder what else he's lying about also? I wouldn't walk away from dealing with him, I'd run away!