Do need weight distribution hitch, drop hitch or both?

I use a 10 inch drop hitch to bring the level to within 3 inches up/down between RV and toad. Tow bar manufacturer says 3" is mandatory. Somewhere else, I read that a drop more than 6 inches puts too much stress on the hitch. A quandary for sure. The drop hitch puts the distance between RV and toad out an extra foot causing drag at steep driveways/dips. I just have to be careful at those situations. It seems reasonable to be as aligned as possible within the 3 inch rule.