Well first of all to FRF. If you go to the curb side of the RV you will see a black pipe with a cap on it, or maybe two, right next to the pipe there should be two pull handles and the handles should be marked. One should say black water and the other should say grey water. this is where the tanks are dumped from. I would have to assume these are the tanks you are talking about.
If you can see the tank. It should have 4 hoses/pipes coming from it. Two should be on the top. 1 is the fill line, 1 is the vent line. There should also be 2 on the bottom. 1 goes to the pump and the other goes through the floor. it's the drain. There'll either be a valve right on the side of the tank that you open or there'll be a cap on the bottom of the pipe where it sticks out from under the RV. Sorry I can't be more specific but they came a couple different configurations. Mine has caps and my buddy's has a valve.
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!
This is for JeffLink but i dont know if you noticed that post was from back in april and you may not get a response from the but I am no saleman but that maybe a little high depending on what he paid for it with thing being tight all over it is a buyers market shop around and check your local dealer and see what they have to get rid of and dicker with them on a price in other words make them give till it hurts lol