Are you in a position to collect it and pay while your there ?
If you are get him to do a cold start, check over the drive train to make sure it's all good and not loose and wobbly, the bearings going into the diff cases are known for going....
Also check the servos work properly, ask if he has a killswitch for it and show it working.....the suspension is normally not that good until you rebuild them, but check there's no leaky shocks just in case
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