I know that in a home, you need to be concerned about expansion, but I think the issue is minimal in the short distances of a motorhome.
What I know is that leaving the recommended gap at the edges of this floating floor allowed the flooring to move enough to open up at the ends of the planks in the center of motorhome, where the frame has the most flex. Or whatever the reason, the "click-lock" tongue and groove is not strong enough to hold the ends of the planks together in this one part of the MH.
I WILL glue mine down to the subfloor, if I do this again.
Life rocks when your house rolls
Senior Chief & the Cheese Queen