I use a Jabsco motor/pump mounted on a board with a small 3 inch line from holding tank and one inch 80 foot long exit hose to a septic tank. Great for my purpose when staying long term with no other option. Have used it maybe 100+ times in last 13 years and it really is a pain in the butt. You have to be careful what goes down the toilet. We have moved an average of every 7 days about 600 times in this period. Two impellers and one motor replaced in this time frame and a few clogs. I would be cautious about a permanent mount. The 3 inch hose approach moves stuff a lot faster and cleaner