You would not want to put it in an enclosed trailer anyways. The load factor on the floor is really dense with a tractor so you will have a high weight PSI, especially if you have loaded tires. I used to haul my SCUT in my enclosed trailer and the fold down ramp did not like the tractor and neither did the floor. I can't imagine what a 3 series would do. You would probably get away with it if you put down some shoring. JD makes a cover for the 3 series, it isn't cheap, like $160 (can't remember it's been since 2017). I stored my 3025e like that for a year until my shop was built. The cover did a great job of keeping everything that mattered out of the weather. The cover is actually made for the European version but it fits nicely.