cheaprvliving.com has an Astro section on converting

I cranked the t-bars and it's almost level. It seems like the newer models are naturally higher so I just needed enough in front to go up a size in tires, and now I think I have it. Mainly wanted axle clearance.

My 2004 Astro cargo AWD is 2" lower in front than in the rear. The rear has plenty of room for a size bigger tire but the front doesn't , plus I'd like to raise it for oil pan clearance. What's the best way to do that? Thanks.