Well, I'll try to help out.
1. The ATV theory has been bandied about for the last 3 years. I don't think it happened that way. I do think it's possible the Wagners parked some distance from the homes on Union Hill Rd at some point in order to sneak up to them. It's been theorized that, because CR1 had cameras out front that allowed him to see cars pulling up to the house, the Wagners decided to approach from the rear of CR1's home. If so, they likely parked and walked. ATM's would be too loud, too cumbersome and too slow in the dark woods. For reference, see Leonard Manley's interview in which he spoke of CR1s security cameras out front. I've posted that link so many times, my brain is fried.
2. CR1 and KR had security cameras at their homes. That has been reported in the news media. They were probably for general security purposes and also possibly to protect the alleged grow ops. Due to the time of year, neither one was likely growing any pot outdoors. Not warm enough yet, still a risk of frost.
CR1 did see the killers coming. Do a google search of the articles from last autumn about the release of preliminary autopsy reports. The recount that CR1 saw the killers coming because he managed to escape into a back bedroom where he was shot several times, once through the door.
It's believed KR was asleep when he was killed, so unable to see anything on his security cams. Because he was asleep. Hope that helps.