go to Lowes or wherever and buy one of those 18"x48" wire shelf units that are NSF rated. Cost 80-90. You can assemble it so that the back legs are off the ground by the height of those wheel wells and then put on the first shelf. I used 4 shelves instead of 5 and it works great. L brackets with hose clamps will hold the front legs to the floor. I used a straight wood connector to overlap the shelf against the wall and screwed above and below to hold it.
You can pretty much put the FE's anywhere for transport. I actuall have mine up front now but I also put a 900lb golf cart in the back. With the double axle it won't add much tongue weight up front. And buy some D rings to install in the floor and uses bolts and big washers underneath and then you can tie down to them. Don't trust the wheel locks to keep the FE's from moving.