After searching long and hard, I finally found a shelf specifically made for the Promaster. That wheel-well hump is about 18" and I've had a tough time finding a shelf that would fit. I didn't want to get the 13" deep shelf. I see Hydramaster makes one now. Yahoo! $469
https://shophydramaster.com/product/custom-three-tier-shelf-for-high-profile-vans/
https://shophydramaster.com/product/custom-three-tier-shelf-for-high-profile-vans/