Good luck finding a reliable rig for a grand. A van or 2wd Suburban would probably be the easiest to find to duplicate a build like that, but I wouldn't start with a thousand dollar rig. Spend a few more dollars for a better rig. Out in Oregon there are a glut of 92-99 4x4 Suburbans for sale up to about 3 grand, sometimes less. Vans are cheap, but they are harder to DIY work on mechanically, and the cheap ones aren't 4x4.
A truck with a canopy would be good too, but you are unlikely to find a decent truck with a decent canopy for a grand. A Suburban has better access, is waterproof, and still has an 8 foot cargo area like a long bed truck. The seats come out easy enough and you can sell them to recoup some of your money. Also, a lot of them have rear heat/ AC too