I've never done it and don't even know if it's possible. I've thinking if it's a laminated trailer, it's going to be nearly impossible to get the type of vacuum bond they do at a factory. If it's a siding trailer, maybe?
I would also investigate just buying a replacement door, already constructed. Seems like it might be the safer bet to let the professionals handle it rather than try something no one is properly equipped for. Just my 2 cents.
2020 Chevrolet 2500 LTZ, 2019 Forest River Wolfpack 23Pack15, 2014 EZGO Golf Cart.