Just because you get a RV, doesn't mean you have to give up backpacking. We like using our trailer as a base camp from which to go backpacking from for a few days. Then come back to the trailer to clean up and repack....for the next little mini-trip. If pack weight is becoming an issue (I don't wouldn't blame you if it was), get new gear and drop that weight down to about 20 lbs.
We started out by looking for a small trailer too. But I didn't like hitting my head on the AC or doorway and we don't like "crawl over beds", so we wound up with an almost 22' long trailer. We have found this length nice for those Fall and Winter trips where, due to long nights, we find ourselves inside more. And the extra room gives us more storage space for backpacks, skis, snowshoes, paddles, etc.
Have fun shopping,
Steve
