the saddle tanks that are out side of the frame on 73-87 trucks are unsafe but the big trucks all run them and have for years with no safty concerns(even the gas powered ones).the rear frame rails are the worst spot for the tank I think.rear end crashes with a small car is the main reasaon.The in cab tanks are safer becsuse there in less chance of leaking.they are also have a better chance of not rusting out.But if you smoke in the cab there is the chance of fumes exploding even tho i have never seen or heard of this.I think there is not safe spot for a gas tank but we all need one.All fuel tank location have problems were the are mounted in diffrent crashes and such.Gas in a confind space is a more powerful bomb the dynamite. So that is why there is no way to make it 100% safe when the are mounted on a vehicle that is driven.This is MY opinion and may not be agreed to by all.Opinions are like noses everboby has one.
