May be a bug problem
Bugs love to plug up the drain hoses by building nests. On a prior SOB trailer, I solved the problem by slipping a plastic strainer meant for a paint spray gun over the end of the hose. I had to open up the hole in the strainer a bit so that it wouldn't pinch the hose shut. I never had a problem after that. The strainers cost only pennies and can be found at Sears, HD, and the like.
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John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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