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I had a quick look at both episodes, and I think that each one used at least two different vans. They're both/all similar Ford Econoline vans, and the ones in '10 Million Dollar Sheriff' obviously have bars on the back windows. One van in each episode has chrome trim over the wheel arches and along the sides while the other doesn't. A close-up of the rear quarter of Jason Steele's van shows a round black or gray gas cap, while a close-up of Russ Mitchell's van shows a body-colored flap covering the gas cap. My guess is that the same two vans were used in each episode.

I'd guess it's the Atlanta Lt. previously mentioned unless that was a red herring. Your cousin could be shucking and jiving 'bout a henchperson. Oh it ain't no shuck and jive. There's a legitimate volunteer awaiting, just biding his time. And the Atlanta Lieutenant is offended to be called a red herring. Plain vanilla maybe but not a red herring...

What about a crossover between Third Rock From The Sun and Dukes?

Macguiver and dukes of hazzard cross over would be cool