The best option here is to get the body and put it on a SCX10, TRX4 or other good crawlering/scaling chassis. You will likely have to do some adjustment to the wheel base, but other than that it should be easy.
Yup. I got a Bigfoot #1 for my youngest son for Christmas. A crawler, it is NOT - even it the chassis was 4x4, it would still make a crappy crawler. Best bet is get a body and put it on a SCX10 / TRX4 / Ascender chassis.