I had a pick up and cap before getting the Excursion. One of the things that concerned me about a suv was hauling things, then I realized that I hadnt taken the shell off my pickup in 8 years.
I built a rack to store the cap when I did take it off. I used 4 4x4s as corner post, just wider than my truck and just shorter than the cap. I attached a 2x4 between each side post. I could back the truck between the "rack", lift one end of the cap and slide a 2x4 between the cap and rack. Then move to the other end of the cap. I used the same clamps to attach the cap to the bed or the rack, then ran a wood screw in each support 2x4 into the racks 2x4. It worked great and I could do it by myself in about 15 minutes.
I kept a rake in the bed to be able to reach items that roll to the front of the bed. I also made a couple thin L brackets which I would put between the top of the bed and bottom of the cap. Worked great for holding a few fishing rods. Another great upgrade was to install a short LED light strip above the lift gate.