I'm reinstalling the sewer hose storage on the Lance, which is just a 4" PVC tube with a hatch on the end. I used to carry 2-10' sections of hose in the TT bumper...most of the time 10' would do it b...
I used a hollow square plastic fence post and cut to fit width of MH. Strapped it to the gas tank supports with long metal screw straps. If I remember correctly it is 5 inches square and allows me to keep fittings on both ends of sewer hose and store a section of gutter for a slope ramp. End caps secured with short bungee cords.