If i dont plug my truck in the night before i usually let it run for a while in the winter, but if i do a few minutes later im off, just use blended diesel, a thinner oil and make sure you have the correct blend for your coolant and you should be fine, the block heaters can be hidden sometimes my dads 02 PSD had one but came from the factory with it we couldnt find it until we went to install the new one and realized there was on already, alot of guys tuck away the 110 cord to prevent damage, im not sure of a Glow Plug that runs on your batteries, any heating Element would draw alot of amps, and starts in cold weather draw it down to so id be afraid of killing my batteries, however these are just my opinions i could be wrong