I ride a garden tractor too, and never fails, I pulsate all night long...it is awful. I assume that is similar to what you describe.

I don't have diabetes, and have some 'idiopathic PN' that is nasty...I also have herniated discs. The pulsating from the mower is bodywide.

I found out if I sit on a foam cushion and wear my back brace it buzzes less.

With PN, no matter what, you get symptoms, though. If you sit, you degenerate, if you are active, you exacerbate....there is no winning....I try not to think about it.