Well without viewing the plumbing on your particular model. There is "usually" 3 winterizing valves on newer class A MHs. 1 bypasses the W/H. 1 bypasses the water tank (or closes it off). The last one opens the siphon hose. If these are not clearly marked, then find your water pump--undo the plumbing hose on the inlet side of the pump, and fasten a siphon hose to that said inlet. Suck in antifreeze as required at that point. (Of course do try to bypass the W/H first)
For more detailed instructions you can view several examples on You Tube, contact a dealer, contact Gulf Stream, ETC. Since you do need to drain all tanks and lines prior to antifreeze
Tim-DW(Kathy)
12 Chevy Sonic DD, 03 JEEP GRAND CHEROKEE, 2001 Jayco KIWI
If a "nightmare" is considered a dream-then I am living the dream