Welcome to iRV2 mexicokid99.
First let the dealer deal with the wet area issues.
To carry the sewer hose, you can fabricate a carrier from 4" PVC pie and the plumbers strap hangers. Our you can buy a hose carrier from your local RV dealer.
Pick a convenient spot under the coach and mount the holder. When drilling the holes to mount, make sure not to drill into an area that will cause damage.
I believe the Aspect has a molded plastic bumper cover.