I had a P30 chassis several years ago. It hung low in the back and I was unable to back it up a short uphill ramp into my side yard. I added the rear airbags with an electric pump so I could easily jack up the rear when I got home. The air bags worked great for lifting the rear end and getting me into my parking spot.
I bought the bags primarily to get my coach in the backyard, but I used the air bags to bring the rear end a little above level and to equalize some lean on one side. I was really surprised to find how much better the coach handled. A much more stable ride and better road manners, including less push from big rigs.
Lastly, you'll never eliminate all push from the big trucks. I found the smaller box trucks pushed even worse than the semis. With that said, I always watch my mirrors and ready myself with a slight left movement to counteract them. You don't have to wear yourself out, just be prepared.