Adding more air to your airbags will not necessarily "raise" the rear by more than a few inches. It will firm up the ride, especially the rear.
Your rig, like mine and a lot of longer class c rigs have a loooong rear overhang. Add to that the weight of your "stuff" loaded into compartments and storage areas behind the rear axle, and you end up with what feels like a "light" front end.
Try running your airbags at your 60-70 psi, but if your heavily loaded in the rear, try re-distributing some heavy items forward of the rear axle. It may help.
Steve & Cheryl + Charlie & Casey, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek
Camping trips this year so far...8