We've had temps down to -15 here, and no problems with my truck, when I tested it it was at 50/50 last year. It took me a while to start cause my battery was cold and dead, but it fired up nice and runs better in the cold than my Honda. I have no bed so yeah, traction is a problem, but I only got stuck once, and three guys helped me push it out. The major problem I had was heat, because my heater is not hooked up (might not work anyways), and the window was down for defrost and signaling so I was just about froze when I came back. My Honda is a pain to drive, but at least it gets warm after like 15 mins or so. I'd love to get some chains for my truck and go around pulling out cars, 'cause that thing has torque like you wouldn't believe. On my jeep I have a block heater, but it just about burned up one day. Where do you go to buy one? The only problems I've had there was water freezing elsewhere than the coolant, condensation around the plugs, etc. Things starting to thaw, but now everything's a slushy, icy mess.
