The problem with longer runs with hose size discharge is not having enough slope to overcome any potential blockage. It's not so much if everything goes as plan with not hitch, it's what happens when things are not always perfect? That's when people start to overthink and the project gets scrubbed.
My situation is my sewer clean-out plug is 40 feet from the closest spot I can get the RV. The slope was only 1 inch per 12 feet, way under the recommended pitch for 1" or less pipes or hoses. The issue my plumber warned me about was if too little water or too much hard solids (regardless the size), dams can form in the small diameter line.
Although you can use a macerator to push the waster uphill, think about the potential for problems. The solutions he gave were these. I could use a larger diameter pipe (3") and with sheer water volume, use that to propel all waste to the sewer line. He seriously doubt a properly functioning RV black tank could create a blockage under the force of large amount of water proportionate to solids. However, this requires you to have the black tank filled with a large amount of liquids and or use a flush king or sewer solution type device when dumping.
If using the sewer solution, he said just elevate the waste line so you have the proper natural pitch on the long run and have the sewer solution just getting it up to the required height at the RV. No need to try and have it force waste through a narrow pipe over a long distance uphill, level, or low slope when you can have it do the hard part for only a few feet at the RV and let gravity do what it does. He said the sewer solution is more than capable of pushing waste a couple feet up to a sloping pipe if need be.
Regardless what you do, my takeaway from is talk was use a larger diameter pipe with extra water and pretty much let physics handle the hard part.
1994 Itasca SunDancer 21RB - Chevy G-30 chassis.
