38-41 Pickup body to frame bolts??

[hotrodA]

I understand that the OE type cab to frame bolts (as furnished by Roy N) have a small spring that is used to allow the cab to move around to cushion the cab and occupants.

Are these really necessary on a truck that will never be off smooth pavement?

How about some thin rubber cushions or thicker webbing between the cab and frame and bolt it directly?

Thanks!