You don't really have to climb onto the bed to make it. You can pull the top part of the mattress back to where you are standing and do one corner first, then the other. Then push the top part of the mattress back up where it belongs.
We use those clips with an elastic band to hold the mattress pad and bottom sheet corners in place. But that's optional. If interested, they are here:
Leyaron Adjustable Heavy Duty Bed Sheet Cover Grippers Suspenders Holder Band Straps Clips Fasteners, Set of 8, White https://www.amazon.com/dp/B018VLONJI..._0WU4xb7S26K2Z
Land of 10,000 Lakes
2016 Forester MBS 2401R
Nights camped 2016: 29; RV to date: 32