>I think you'll find that a 10 kg weight will do the trick, if you
>cantilever it maybe fifteen feet to the right of the main body of the
>vehicle.  You can use a rack-and-pinion mechanism for fine-tuning.  It >may
>be wise to rig an agricultural mower mechanism along the front of this
>device, driven hydraulically from the power steering pump -- in that >case a
>similar weight will probably be necessary extending to the left of the >van.
>
Another solution is to attach a vary large helium baloon to the heavy
side. My math may not be absolutely correct, but I figure a baloon about
250 feet in diameter filled with helium should equalize the weight
imbalance.