I own a 2014 Newmar Dutch Star 40' coach. I have the same issue. I added a solenoid to the rear air valves that lifts the coach 3" with a momentary switch. Source Engineering, a vendor on here makes a kit, originally for Monaco motor homes, to do this. Their kit provides two solenoids to temporarily lift the rear of the coach. On your coach and mine, the Freightliner chassis only uses one solenoid.
Basically, the solenoid bypasses your ride height valves, (the valves that cause your coach airbags to fill and deflate) and temporarily fills them, while the switch is held down. If I recall, the kit was about $200.00. It can be installed by someone with moderate DIY skills.
Since the system on a Freightliner chassis only uses one valve on the rear bags, the addition of the valve as I have described, also lifts your tag axle too.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab