Lifting my class C

I would start by taking the MH to a flat area parking lot and check the front and rear ride height and compare it to specs for your chassis. On a 30 year old MH chances are the springs are probably weak. Next weigh the front and rear wheels. Ideally teach tire should carry the same weight, just looking at your MH I would guess the rear carries more weight and the front end is too light. My guess is your WB is 138 ins, if so it will be hard to redistribute the weight but you should try. Once the ride height is fixed by adding spacers or springs you may gain a few ins of GC. Higher aspect ratio tire would help some also. I think someone on here added air bags but said they did not add much ride height if the suspension was good, only added if weak. Good luck.