7 x 14 or 7 x 16 would be a better option. Its tough to get out of the RZR once you get it in the trailer even if the cage clears the back door. Most 6 x 12 trailers are single axle and although lighter to pull they are not near as stable as a tandem axle. You probably want something with 70 inch clearance on the rear door if possible.
Who is riding Friday and where/when do you want to meet? We will be staying in St. George with Cindy's folks and were pretty flexible on where ever you all want to ride. I've been to Mesquite and to Sand Hollow but have no idea where the Maze is located. Looking forward to riding, just need to know the logistics for Friday and Saturdays ride????