The actual floor on the BC is 54 inches between the wheel wells, and 80 inches from the galley to the start of the ramp. You've got another 2 feet or so of rear ramp, but I would suggest you put a piece of plywood between the edges of the floor/ramp ledge, as the door is not meant to carry much load. We had one latch fail and it is just luck that the whole back ramp didn't fall...
The picture in the ads appears to be a large Can-Am ATV, which is likely in the same size range as your X2.
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