Greetings! I recently purchased a '91 Warrior and am coming to realize by comparison with other Toyota RVs I see (dolphin, sunrader, etc) that the rear end is very low to the ground. I've scraped it a few times on driveways and gas stations. Looking to raise the rear end. It currently appears to have an air shock mounted. I pumped it up to 150psi (suggested range was 80-200), didn't lift up the rear end much. Any ideas if I can get a lift kit or something to increase rear clearance?