Don't know about the leveling jacks issue, but one thing I can say is that we've been completely satisfied with HWH.
We went to their headquarters last year because we had had a continuous problem with one of our slides. The dealer said they fixed it, but they didn't. Winnebago wouldn't back it (even though the problem had started while we were still under warranty) and finally referred us to HWH...as we were already on the road to the Winnebago factory because we had a scheduled appointment with them. (It's a long drive from Texas).
Fortunately, HWH made room for us. We arrived a day early and they accommodated us. Not only did they get us in a day early, they identified the problem within minutes and fixed it within 2 hours. On top of that, they allowed us to hook up at their facility for the night! Nice experience with everyone at HWH! \
Can't say enough nice things about them.