A sedan is great on the road but crap off road, a jeep is great off road but crap on road.
Can the 2 be combined, yes (Mostly) but the price goes through the roof.
A Workstation is cheap and an arranger is expensive (Like for like) and people moan about them being too expensive, so the market for the 2 combined is virtually zilch and thus unprofitable for the manufactures.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).