Will not be possible to stretch a 3.2" tire over a 3.8" rim//Thats like trying to put a 15" car tire on a 17" rim..Just not possible..

I found that HPI dirtclaws is also very good for bashing and good on just about anything you run it on..Sidewall not that high so still handle okay compared to racing tires..

On my truggy i'm using HPI dirtbones just because its so light weight and have nice sidewall for jumping and bashing.We play on grass most of the time and they work super on grass and hard pack dirt.