The slide toppers should have an anti-billow device, if it is missing the air will catch the exposed topper and roll and unroll. The switch for the cruise disconnect is likely on the brake pedal, a simple adjustment should fix. If it is more than that, a chassis service center would be where I would call first.
Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
PROV23:4 Do not wear yourself out to get rich; have the wisdom to show restraint.