I didn't take super exact measurements for a camping setup, but here is what I have -
Inside dimensions of bed-
110" long x 74" wide x 60" high (bottom of tarp bows)
steel sides are 18" high
wheel wells in bed -
10" wide x 12" high x 41" long , 30" from rear inside of bed and 39" from front inside of bed
the flat tops part of the wells are about 24" long
If we get a break in the rain tomorrow, I can try and check the height more exactly.