I decided to put my mind at rest and come to my own conclusions. Here goes.
passenger side front with a yard stick and a straight edge. 19.5 give or take a fraction.
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passenger side rear same thing.
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Rear of camper, passenger side top part. 8.5/8 give or take.
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Rear of camper bottom part. 12 inches
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Front of camper passenger side top part. same measurements.
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bottom part. same thing.
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It's also not the camper floor giving way because I had the whole bottom out last month repairing and electrical problem.
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I will have the camper back on the truck in a day or two after I get done with the job I'm doing and take measurements again.
My Truck and my camper are square the illusion lies in the width of the front and rear of the bed.
Front of the bed is 64 and three quarters inches from the inside of the stake to the inside of the stake. Give or take.
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The rear of the bed is 62 and three quarters.
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It is an illusion!
Sorry about the pics but my left hand don't work all that great anymore.
Joe