We just got home last night to Denver, Colorado from the Arizona HOC Quartzsite Rally and I winterized our Heartland Trail Runner this morning before I went to work.
Took about 10-15 minutes now that I understand what to do.
I ran out of RV anti freeze and I didn't get the outside shower winterized, so I stopped by Walmart on the way home from work tonight and got two gallons and just finished it off a few minutes ago.
It was in the mid-70's here today, but expected to cool off tomorrow and go below freezing tomorrow night, with snow coming this weekend, so I figured I'd better get it done post haste!