In order to determine if the Buyers Products Tri-Ball Hitch - Tubular Shank with Black Towing Balls # 3371802202 will be long enough for you to open your van's doors you'll just need to take a quick measurement.
This tri-ball hitch measures 8 inches from the center of the hitch pin hole to the center of the hitch balls, so you can measure 8 inches out from the hitch pin hole to see if your doors will be able to swing open without interference.
I have added a link below to a video review... view full answer...
The plug on the Derale 4" High-Output Extreme Paddle Blade Electric Fan - 125 CFM # D16104 is a Yazaki 7122-2125 (or equivalent) and the pins are a Yazaki 7114-2020 (or equivalent), according to my contact at Derale. view full answer...
It sounds like you need an extended ball mount like the Curt Class III item # C45270. This one is 13" long has a 2" rise and 4" drop. It has a 7,500 lbs weight capacity. I don't know how long your current ball mount is or if it has any drop but this one will definitely be longer than any standard ball mount and give you enough clearance to clear your propane tanks.
For a 2" hitch ball I recommend the Curt item # A-90. view full answer...
The dimensions for the Bulldog Winch Winch Cover # BDW20046 are 21" long x 8" x wide x 11" tall. Attached is a review video for you to check out. view full answer...