I'd like to see them negotiate that trip without any sort of backup.
Would be boring as they wouldn't get very far, and they wouldn't dream of vandalising each others cars in the way they do, which just adds to the comedy.
I honestly couldn't care less if all 3 cars had new engines put in half way through the trip, which we weren't made aware of. It doesn't take anything away from what was a very funny special episode.
People love to moan and nit pick, why can't you just sit back and enjoy the entertainment? You all sound the same as the people who moan about the freshly cut grass on walking dead... Too busy analysing the show to enjoy what's happening