I have a 46 1.5 Ton, and have been removing one spring at a time to 'soften' the ride just a bit.
As I will NEVER carry a load on the flatbed, I am guessing it will be ok.
I have now taken out 2 in the front and 3 in the rear. (added some spacers to keep deck height) and I can finally start telling some difference. I may take out one more front and one more rear.
I did start noticing it wanting to 'bounce' a little on the highway going about 55 or so.
I was thinking shocks might be the answer AFTER I take out a couple more leafs.
Anyway, a 1.5 ton is not for 'soft rides' anyway, just don't want it breaking my spine hitting a few bumps in the road.