Yep. Done about a zillion linear feet of blocking that way (at least
it seems that much. Blocking is _boring_ work). Not only can you
drive a screw anywhere you want, but you know the screw won't pull out.
And, the load is distributed along the whole wall. Also, scrap 2x or
3/4 ply is abundant in pieces 15 7/8" long.

Regarding an earlier post, I think maybe the french cleat idea is maybe
not so good, seeing as how the RV will be going over bumps and whatnot.

Hope it helps.

-Phil Crow