Get an RV brush and telescoping wand
(like this, click here). Then you can stand on the ground and simply drag it along the roof line of your camper knocking out any debris that collect in the gutters. If you attach a garden hose, it will washing out the gutter even better.
You can also use the same wand and brush for washing the side of your camper and these brushes work great for washing cars and truck (and work as brooms when the bristles are dry.)
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About the time everything starts going well, something else breaks!
2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab