On the block, just above the pan rails, there should be a plug or valve into the water jacket. the logs, if equipt, should be drained also, by removing lower hose to the log. On headers, I unhook the water feed and drain. I have also used RV type 'pink' antifreeze, enviromentally friendly, in both the block and logs, no need to flush before hittin the lake in the spring. I keep filling the t-stat housing till it runs out the jet intake, ~2 gals. Temps here get to ~ 25*F, and Big Bear dropped to ~ 10*F
Fuel, I pump out as needed, and run in the jeep, motorcycles, generator, tractor, etc. 40+ gallons usually lasts all winter, at least till march.
I also park the trailer on plywood, or 2x6s, to help protect the tires. (gravel backyard)
I usually change the oil, fuel filters, service the pump and wheel bearings at this time. Put big azz icechest into the jeep too.
All this is usually after Thanksgiving.
Thats all I got
Daniel