Any mud fanatics? (I have a retard Q for ya)

[Chevy409]

I've seen some pretty cool mud rigs that have their radiators out back mounted in the bed to avoid the flying goo... but how do they get the water back to the engine? Is it just rubber hose routed all the way from the front to back, probably along the frame rail or something? Seems like that much hose just waiting to be slapped with a stick and in the open is asking for trouble. I'm prtetty interested though and appreciate any and all info on the subject. Thanks.