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Seems to me that any Airstream could be raised. Dura-Torque or not simply by extensions of the chassis axle bracket being fabricated and welded on similar to what was seen elsewhere on this forum on a vintage Caravell. Upper shock stud would need relocation as well. There might be some creative hitch work needed also.

Don't have a clue as to effects on aerodynamics, can anyone think of any other advantages and disadvantages?

Such a lift would surely help with tail-strike, but the clearance under the "axle tube-:to:-ground" would of course be the same as before, so would it really improve much off/back road travel??