Pic is just from google images since I couldn’t find an example of it happening in action. I’ve seen it several times on Snoqualmie pass that typically on the down hill sections, snowplows will raise their bed all the way. Why would they do this? Wouldn’t that be way worse for their center of gravity?

It puts more weight on the rear axle which provides more traction.

To disburse sand or salt from the dump bed. Some just do it by gravity, some have mechanical spreader attachments to ‘fling’ the material across the lane(s)

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Join the WSDOT Facebook page and ask that question. They are generally pretty responsive.

>to get more weight on the rear tires as the front is already weighed down by the engine

That is my thought. Trucks of all kinds are front heavy only. Downhill in icy conditions is especially dangerous.

They also store the truck bed up to drain rain water. Gravity media distribution when coming down the pass if they don't have a spreader.

Not only the engine, but the weight of the massive plow.

They’re dumping sand on the road

My sister with state patrol dispatch. Got call one night from lady to report a truck leaking/dropping it's load on the road and hitting her car.

"mam, that's the road plows clearing and sanding the roads, now stop tailgating"