I wanted insurance just for a weekend so I could drive a 78 GMC 6500 dump truck home to part it out.
My regular insurance people absolutely would not insure it because it was a dump truck. I inquired, "what if I had an S10 Chevy with an itty bitty dump bed?" same deal they absolutely would not insure a dump truck.

In the end I paid the uninsured motorist fee for the minimum of one month (not expensive), bought my one way trip permit
($5), and carefully drove it home, about an 8 hour ride.

And I would have preferred to be on the safe side and pay for regular insurance for the weekend, and would have if not for the dump truck part...

For your truck, what if you pull the driveshaft off the PTO, or somehow disconnect it, and also bolt on a bracket keeping the bed from tilting. Then it is an ordinary non dumping truck, will this satisfy your insurance?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-