If you're going to be "permanent" on the site, I'd build a rigid PVC pipe using a twist on elbow to connect to the RV dump opening and install from there to the sewer dump.
If you're going to be "semi-permanent" on the site, I'd do the same thing, but also install another twist off connection after the elbow so you can remove the rigid pipe assembly without having to saw it in half.
Whatever you do, DON'T modify or remove the existing dump setup from the RV, adapt to and connect to what's there so you aren't "undoing" anything if you do decide to travel.....
If it's going to be "durable" and "trouble free" you need to completely eliminate any "spring wound flexible" sewer hose from the system. Eventually any of the "RV sewer hose" brands will either start leaking, split or get stepped on and rupture.
Total cost to do a 20' run shouldn't be more than about $20-30 with the 4-prong elbow, 3" (or 4") sewer pipe, elbow for the other end and a small can of PVC cement.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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