YOU CAN TAKE THE SPARE WHEEL (USE WITH MAX 50MPH)AND TO USE IT AS A TRAILER SPARE WHEEL.
I HAVE MADE ALSO A SYSTEM (YOU CAN USE A WHEEL HUB WELDED TO A METAL TUBE) TO USE IT AS A THIRD TRAILER WHEEL IF YOUR 4X4 GET STUCKED IN THE SAND & WITH THIS WHEEL AND WITH A ROPE YOU CAN TOW THE TRAILER OUTSIDE OF THE SAND .
IF ANYONE LIKES THE SYSTEM I CAN GIVE MORE DETAILED PHOTOS.