This is a video of the roof rack I added to my Leer truck topper / cap.

A.R.E. Truck Caps and Tonneau Covers : Mid-West Truck Accessories

Leer 100 XR camper shell Thule roof rack system

Leer Accessories Reno - Custom Truck Accessories

100XQ Sport Truck Cap

Leer Truck Caps Fiberglass Painted to Match for Pickup Trucks

Nissan Titan with ARE Cap and Rhino Rack Vortex Quick Mount Roof

Cargo Racks by AA-Racks. Details:The Steel DX36 is a universal rack system that can be installed onto any fiberglass pickup truck topper, cap or camper shell (drilling required). All steel systems are powder coated for superior protection. The extra wide mounting base uses polyfoam gasket and interior plate to secures the rack system onto the vehicle. Cross bars are made with 17 gauge steel and mounting bases are made with 11 gauge steel.

AA-Racks Model DX36 Universal Pickup Truck Cap & Topper 2 Bar Ladder Roof Van Rack System Adjustable Steel Cross Bars - Sandy Black

LEER 100XQ Sport Cab-High Truck Cap

Thule Topper Rack System Factory Sale

VAUXHALL AGILA - UNISTRUT Roof Rack Build Part 1

LEER ACCESSORIES - A&A Toppers

Roof rack hack part 2