S-n-L,
If you love your wife, buy your wife something she loves (not anything anyone else suggests). If she loves it she will want it to be with her fulltime (get it?).
Can you think of anything she doesn't have in the RV that she really misses (think as big as you can)? While things are different in an RV, love is exactly the same. Find that "thing" but don't buy it just because it has an RV printed on it. There is a special thing and you can find it, it just may take a bit of thought.
I bought my wife her favorite china one year and, while it's not a valentines day gift, I have a similar gift setup for your Feb. birthday and I know she will be excited. It's just us so it's not purchases meant to impress, only purchases meant to make our full time home feel like our home.