I just bought a new to me vehicle that I'll use as a daily driver. I am going to keep my pickup truck and only drive it 1-2 times a week. Is it safe to leave a vehicle plugged in for an extended period of time? I will be going on a vacation at some point this winter and don't want to come home to a dead truck. Would installing a timer that only supplies power to the block heater for 2-3 hours at a time be a better option?