I can think of several reasons not to run a spool in an offroad car.
It will be terrible on bumps.
It will put a lot of strain in the drivetrain and more than likely lead to heavy wear / breakages. - (In this respect a very tight diff is a better option, which will drive similar but be less prone to breaking.)
If used on the front of a 4wd it will understeer into corners
On the rear of a 2wd will mean the car will understeer up to a point then swap ends. - Ever seen a mardve with a mod motor in it?
Back in the day 2wd cars had all sorts of crazy features.
They also had absolutely no power so pretty much anything would work!
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