I do a fair amount of traveling with the boys, for most of the summer, we were either at home or up at the cottage. To help Brendan with his naps up there, I kinda replicate his sleep environment so that it's similar to home.
I bring all his sleep blankets (mattress sheet, his "blankie"), I make the room as dark as possible, since his room at home is very dark, and I bring his fan (white noise). He also has a "Gro" Bag which is kinda like a sleep sack. Essentially he has the same textures, smells and sounds, that he would have in his home bed room.
Hope this helps!