Allroad Level Warning

[Kneale Brownson]

My  2004 Allroad developed a level warning light while I was towing a 
trailer between Michigan and Colorado.  Car was sitting a bit high, 
especially in the rear, there were no up and down lights on the 
dashboard switches but everything else worked, so I completed the 700 
miles left to go.  When I got to 10,000 feet of elevation and 
disconnected the trailer, car was sitting a bit higher than while in 
Nebraska, where the warning appeared.

I have found the big 40-amp fuse and the relay buried ridiculously deep 
in the driver footwell to test all right.  I have replaced the expensive 
level control "computer" and the situation remains the same.

Any suggestions other than coil overs?