I found them finally, they were in front of tires on passenger side. I drained them, but had to turn on water pump to get it to all come out. I kept a check on level turning off the pump every so often and checking. Now should I put antifreeze in tank?
No, don't put any RV anti freeze in the water tank. You will never get it all flushed out.
Use the winterizing system you have in your trailer.
Here is a thread for you to read that will explain the process.
My 2005 Crossroad Cruiser CT30 RL has two drain valves located near the hot water tank, below the floor and between the floor joists; but they are accessed from inside the trailer. Kind of a pain to get to.