Advice needed on winterizing water tank and pump

Thanks for the quick response!

I did run the pump dry. This year I had to do some repairs the the MH that involved removing the fresh water tank, pump and did some custom re-plumbing so that I can fill my fresh water tank from city water, isolate the pump from the water system,
reroute the tank drain and suck in AF all using pex and new ball valves. so I should be able to get the AF in ok, this will be my first time using the AF input, so we'll see how it goes.