L.E.D trailer lights

Has anyone had any problems with L.E.D type tail lights on their off road camper trailers, I have just had several discussions with the people making my camper trailer, and i wanted L.E.D tail lights fitted, but they said they have heard a few rumors about the L.E.D tail lights not handling off road conditions well enough for them to risk putting them onto my camper trailer, and have already put standard lights on. i thought the L.E.D's were virtualy bullet proof, which i why i was ready to pay the extra money, but now its too late as they have welded a surround around the tail light that they'd have to grind off to fit the L.E.D's....and I'm not real keen on that idea when ordering a brand new camper.
So its not a whinge about the company, I'm not losing any money because of the lights, I would have of course preffered the newer style L.E.D's I only want to know if people have had L.E.D lights on their trailers a while, and been off road and had any problems.....I thought trucks now used them, including road trains,which as you all know drive thru some fairly rough conditions.