I didn't discover this anomaly until about a year in when I noticed denting occurring in the front of the bed and on the camper where it meets the end of the bed. A result from the rocking motion from the built in see saw. Also noticed the distance from the bed rails to the camper was not uniform from front to back. Gap was less at rear. So I made a wedge using 3 pieces of 3/16" wood sheets glued together. So its 9/16" on thick end and 3/16" at the thin end. Its 50" wide and 21" long. Then I slip that under the rear of my Dee Zee bed mat.As you can see the mat leaves rubber on the wedge but little on the thin end leading me to think its too thick at 9/16" or too long. So I wanna make another using 24" x 30" trucker mud flaps which will need trimmed. MY QUESTIONS....About how much drop is there on a 2016 Chevy short bed from the crown to the end of the bed? Can I ignore putting anything on the other side of the crown?

Why wouldn't you just use a straight edge and measure it?

I first placed a 1&13/16” thick x 6” high piece of lumber across the front of the bed with a a 3/4” thick piece of HDPE attach to the lumber to keep the TC off of the front of the truck bed. I have a rubber bed mat in the bed, then I placed a piece 1/2” thick horse stall mat on the rear of the truck bed to compensate for the crown. I placed a straight edge, front to back, to find where the crown started to tapered to determine where to place the shim.

There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.

MORSNOW wrote:There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.Didn't you trim some off the length of your mats?

My 2016 GMC long box is 7/16" drop at tailgate when straight edge is run from front of the box.I need lift for my camper and use two 4'x8' 3/4" sheets of plywood. I shim those with a 1/2" x12" plywood piece across width of box at tailgate.

Compensating for GM crowned bed | Good Sam Community

Z-Peller
Explorer
Apr 09, 2021
My 2016 GMC long box is 7/16" drop at tailgate when straight edge is run from front of the box.
I need lift for my camper and use two 4'x8' 3/4" sheets of plywood. I shim those with a 1/2" x12" plywood piece across width of box at tailgate.
dhull
Explorer II
Apr 08, 2021
MORSNOW wrote:
There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.

Didn't you trim some off the length of your mats?
MORSNOW
Navigator III
Apr 08, 2021
There is a center crown in the box around the axle area to allow water drainage front and rear, it is obvious when I ran a 4' level lengthwise in the box. I put two rubber semi mud flaps side by side in the back half under my rubber camper mat, problem solved.
Geo_Boy
Explorer II
Apr 08, 2021
I first placed a 1&13/16” thick x 6” high piece of lumber across the front of the bed with a a 3/4” thick piece of HDPE attach to the lumber to keep the TC off of the front of the truck bed. I have a rubber bed mat in the bed, then I placed a piece 1/2” thick horse stall mat on the rear of the truck bed to compensate for the crown. I placed a straight edge, front to back, to find where the crown started to tapered to determine where to place the shim.
Grit_dog
Navigator
Apr 08, 2021
Why wouldn't you just use a straight edge and measure it?

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