Consider going back to an earlier thought of a Chevy Express 3500 at Boulder Offroad Vans, especially if you want to stick with the Chevy. They do all vans, but seems really specialize in Chevy vans. They use Dana 60 axles, not IFS, but with springs upfront and well paired shocks, they ride very well. The AWD Chevy is pretty low to the ground, and AWD. After conversion the lift is probably 6 inches.