Automotive repair shops have a tool that latches onto the lens and adjusts the lights while the vehicle is sitting level. It would probably be hard to get this done with a motor home, unless it was an RV repair shop.
The poor man's way is to find a vehicle, like a pickup truck where the headlights are mounted about the same height as your motor home lights. Find a closed business, at night, and a flat area adjacent to the wall of the business. Park the truck about 20 away and perpendicular to the building (measure the exact distance from the glass on the truck headlights to the wall). Find the center point of your vehicle (distance between headlights) and mark that on the wall with some 3M blue tape. Also mark where the headlights are striking the wall. Return with you motor home and make sure it's parked in the same position as the truck and the same distance from the wall.
If, for example, the headlights on the truck are spaced 5' apart the motor home's are spaced 7' apart, you can measure outward from the tape marks on the wall for the truck's headlights, one foot out from each light. This will give you a general area where the lights should be adjusted.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab