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My local trailor place refused...I want one in mine, but they won't put it in. Says its not framed for one...I also assumed you could put one in like a window in a house, what do I know.
Depending on the trailer, its construction, where the load is carried, and the location of the escape door to the axles and the hitch, I can see that piercing the solid outer skin might causing buckling issues even with a modest door frame. Furthermore fed regulations have been greatly increased lately on trailer designs on the engineering and testing the feds require (way overkill IMO). To have a company modify an existing trailer opens them to many legal liability issues, and not likely worth the potential hassle. Any company qualified to do it, likely won't, and any who will, might not be qualified. A good analogy is the fatigue structural failures on the liberty ships in WW2.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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