It might be worth looking at this one. It may give you enough room:

https://www.titanramps.com/carriers/atv-carriers/raised-atv-utv-truck-bed-rack/332022.html

I've used bungie cord to keep tailgates up when hauling an ATV that was too long to allow the tailgate to close.....close to closing but couldn't. The cord from latch to latch on the back kept the tailgate up against the back tires.