If I recall correctly, the installation instructions I had with one batch of pergo said that you basically have to do the same thing you do for any edges: that is, leave 1/4" gap for expansion. For any protruberance through the floor, you should leave the same 1/4" gap. so if you've got, say, a 1/2" pipe for a radiator or some-such, you make a 3/4" inch hole for it, so that it, too, may have that little bit of wiggle-room that it might need.
they're talking about installation in a house, though. I doubt that they tested and approved any set of instructions for RV's.
on the one hand, you've got a much smaller amount of square footage to deal with, so one would think that the potential for expansion is that much smaller. heck, if the 20' x 20' room where I installed pergo in my house only needs a total of 1/2" in any direction, one would think that the 8' wide trailer could get away with that much less. Then again...the climate in my house is controlled all year round, whereas it gets mighty cold in the trailer in the winter...and mighty hot in the summer.
So, the answer is: I don't know.
It may or may not be a problem. There are some types of floating laminate that say that you do not need to leave any gap for expansion, because they don't expand or contract enough to require it. In a perfect world, I'd go for that type of material if I wanted to attach anything to the floor. I do know of one person that put a parquet floor in his trailer, and re-installed the cabinetry on top of it, and later had problems with the floor buckling. But that type of material is probably more prone to expansion, anyway.