The 2nd main reason we got a TT, (other than getting too old to sleep on the ground), was to have our own bathroom/shower. No more trips across the CG @ 3AM to the bathhouse. On our 3rd TT, never had any problems with draining the tanks. I'm sure the secret is to use PLENTY of WATER to do your rinse. With or without a flush system, a clear 45 or 90 degree elbow is a must. If you have sewer on your site, allow yourself plenty of to completely flush your tanks. If you must use the dump station, be as quick as possible and clean up after you finish. I use a dedicated hose for the flushing, using a tee at the water faucet, and backflow preventers on the tee. Not a hard process to master, you'll get it down soon.
Remember the old plumber's rule: It all goes downhill, Payday's on Friday, Don't pick your teeth with your fingernails.
Charlie & Lizzie the Mini Dachshunds
2008 Jayco Eagle Super Lite 30.5 RLS
2006 F250 XLT Xtra Cab Long Bed 6.0 Diesel
24 hours in a day, 24 beers in a case. Coincidence? I think not.