Driving on dirt roads a problem?
 

Why do you think driving on dirt roads would shorten the pipes life span?

Flying rocks knocking paint off, and or getting jammed into the nooks and crannies, causing rust to have a place to start. The rocks getting stuck in places can cause rubbing and wear on the lines causing a leak. Also, any rust that gets formed on the outside, gets knocked off excellerating the rust process. Living in the salt belt is bad enough, but add some dust and dirt, a little rain, and you get rust in places you never thought of. Yes, it keeps me busy in my day job.

I imagine you can replicate that U-tube with stainless-steel tubing?? That'll provide the cooling better than a rubber hose.