Go for it.
I've noticed RARing is just a tad harder in P:M. Probably just from the lack of buffer... or perhaps them changes that allow dash dancin'. Hell if I know.
I don't really RAR that much anymore. Wolf doesn't desperately need t' RARB-air to be viable anymore, I prefer P:M Marth's F-air over B-air, and I'm not a Peach player. Although I do wall with RARB-air when playin' Meta if the opponent is at a high enough percent for B-air to knock 'em off-stage. That move's range is a tad deceptive.