How to drain freshwater tank on 178

I have been reading the forums and still can't figure out how. We have a R-Pod 178 and don't know how to empty the freshwater tank. At least I think it has water in it, it sloshes when we back it up. We bought the pod second-hand and probably got too much info at once. Do we have to have the water pump on to drain the FW tank? We have camped once but used a hookup so we didn't use the FW. My husband remembers the seller telling us to be careful running the water pump because we could burn it out. So we are not sure how to use it. I can't seem to find the answer that answers the question. I've watched videos and read lots online, but am confused at best. Since we live in south TX we won't be winterizing so there is no need for the pink stuff I keep reading about. I feel really silly asking how to drain it, but I need to figure it out. Thanks in advance.

Thanks TT, I had looked under and seen that tank and that's what I thought was the FW tank. I unscrewed the cap but only a couple drops came out. But that sounds like where the sloshing noise came from. Before we left the campground we drained the black and grey water tanks and once home we hooked up to our house water trying to work out a water pressure problem (it was the filter). Then I dumped the grey water again and unscrewed one of the low water drains. I couldn't unscrew the other one though. Where else could water be in the pod if not the FW tank?

Perhaps the drain is clogged. I guess I could add some water to the FW tank (just to be sure it had some in it) and then turn on the water pump. I'm guessing the pump doesn't need to be on then to drain it?

If and when you drain your hot water heater, make sure your water pump is off and as Tars mentioned above, make sure the bypass valves (3 of them) are adjusted so that water will not enter the hot water tank.  Be certain to open the pressure valve at the top of the tank to relieve any pressure before using your 1 1/16" socket to drain the tank.

When I winterized our RP-179, I noticed that a considerable amount of water remained in the fresh water tank after I removed the plug and all the water seemed to have drained out.  I just ran the pump until water stopped coming out of the faucet and let it go at that.  I did also drain the hot water heater, open the low point drains and ran the pink stuff through all the lines.