REWARDS - Respect, Cesar's (Badlands) missions unlock
TT wants you to steal a harvester from some survivalists. Make your way to the yellow blip on the radar and park in the red marker. The harvester is in the back (blue blip) and you have to make your way back there. You should ride around to the back of the farm, then making a beeline towards the harvester. This is probably the easiest way to get to the harvester, rather than stealthily moving around the compound and wasting time and your health trying to get there. Hijack the harvester and run over the driver and any people that happened to follow you there.
Once you have the harvester, drive your way out of the compound and head towards the yellow blip on your radar. A single truck from the farm will follow you and chase you. You can ram it with the harvester if you like or just take care of the guy in the bed that's shooting at you. Once you park the harvester in the red marker in TT's garage, he'll thank you and tell you to go get that cash before he is finished. The mission is now complete.