I go to the Boeing office a lot at I-70 and Pena which is on the way to the Airport, the Airport of course being at the end of Pena. I would say the opposite about the light rail, avoid it all costs, it's slow, I mean terribly slow. It's mismanaged, underfunded and stands riders frequently.
https://denver.streetsblog.org/2017/10/18/rtd-cant-market-away-low-r-line-ridership-and-shouldnt-fund-empty-rail-over-full-buses/
I'm not a fan personally since I no longer live in the city, but a lot of Boeing guys live in redeveloped Stapelton area, it's right on I-70 and about 25 mins from the airport. It has a lot of housing for single guys.
Oh and I don't think you will have any issues with a set of good tires and your BMW. Plenty of those around here running all year round.