A short bed works OK but driving around town a long bed makes almost no difference. I wouldn't let that drive the choice. Only place where I've seen it make a difference is if you have a small garage and it simply won't fit. We got a short bed this time because it was a good deal. If we were buying new or had two equal deals, long bed would be our choice.
By the way, 5ers are not good for rugged service roads. If that's how you want to travel, I wouldn't recommend a 5er. Depending on how rugged, I would at least move to a travel trailer if not a truck camper. If the rear drivers side tire drops into a 4" deep hole while the trailer passenger side tire drops into a 4" hole...expect Mr. Trailer overhang to meet Mr. Bed Rail in a very solid way.