Big Lew

I'm just starting to do some research and build my truck. I just wanted to thank everyone for the info provided here on this site. My wife and I wish to do a lot of traveling and I'm leaning towards the 3.0 One question....it seems we always go through a period where gas is so difficult to get, is it the same with diesel? I would think that the 18 wheelers would have priority with their hauling and keeping America open, so is there ever an issue with obtaining diesel fuel during these times?