It depends how you want them to fit. You can fit those 2 sleds into a 7x14 cargo trailer with no problem. It would be tight with two long mtn sleds but they will fit. We fit 4 longtracks into my 7x22 sled hauler. If you want to have them side by side, then you need at least a 8 1/2x12' or 14' long depending on the machine.