Expert-steering vague fully loaded-any remedies?

with about a ton in the expert van, the steering felt very light and
unstable.
It improved some when I pumped the rear tyres up to 40 psi
Is there anything else I can do to improve handling when fully laden?

 

Drive slowly

Andy

 

set all pressures to full laden pressures as displayed on the tyre pressure
chart
in your habdbook and retry

 

Just as a matter of interest - what is the maximum load these things are
meant to carry?

Ron Robinson

 

Just as a matter of interest - what is the maximum load these things are

Two versions, one has 815Kg payload, the other 900Kg

On that basis, a ton is overloaded. Especially if the weight distribution is
poor.