gkainz,
Hunting Unit 49, N/NE from Buena Vista. Looks like the tag also covers units 57,58, & 581. Haven't gotten squat about the area from my hunting buddy who is driving in from the Bay area of CA. Looked on Google Earth and saw BV is in a agricultural valley next to a river. Be tasty deer if they munch in the alfalfa fields.
I'm tending toward the same way you set up your rig i.e. winterizing my rig, having jugs of water inside, etc. My buddy tells me its in the teens during the day which has to mean it drops below zero at night (they rent a cabin). They also road hunt a lot which i've never cared for. My brother was working the Grand Canyon during Thanksgiving a few years ago, temps in the single digits, did exactly like you suggest, and it worked well. Very glad to hear from a hunter. I'll look at the atlas for Arvada.