I bought and am very happy with a folding hitch basket. I'll post the links below. I also bought a waterproof bag that has built in tiedown straps that attach to the basket which held up with a drop of water leaking on a 6 hour downpour.
Advantages of this basket:
1. Folds up when not in use. Sits less then an inch from the rear doors in the up position but will not ever hit the door.
2. Wide 60" basket allows more room then most baskets I looked at and the looks fit in well with the Van.
1. Rear doors can't open when installed because they hit the rail.
2. Hitch bolts to the mount (very secure) but requires you to carry a 7/8 wrench and it installs on the left side (which is a little harder to access on the Sprinter because that's where the trailer plug is located)
I absolutely recommend the folding basket, since you can still fit in a regular parking spot with it folded up when not in use.
If anyone has a similar folding hitch that DOES allow the rear doors to open, please post it. It's never been a big issue, but it would be nice.
Here are the exact models I have:
Amazon.com: SportRack A30850 Folding Hitch Basket: Sports & Outdoors
Highland 1041700 Rainproof Cargo Bag : Amazon.com : Automotive