Found this photo in the Tractor Photos on this site.

• Case 400 in Tractor Photos

They have dirt-track dead weight pulls at the tractor show in Oakley, Michigan. The pictured sight is the norm for the more competitive tractors in that type of pull. Of course, they constantly dampen and groom the ground in an attempt to keep conditions uniform, and three or four tractors are usually pulling on the same track in different places.
Personally, I like dead weight pulls better than transfer pulls since power and speed is not as critical as when hooked to the T-sled (less dynamic effect). Tractor setup is more important. Thus, it is harder to buy the competition with engine work.

That dead weight pulling just doesn't appeal to me. Everybody has their thing, but this ain't mine. Watched some video of dead weight pulls on concrete- looked like about the worse thing you could do to a tractor. To each his own, I guess.

They also have cement dead weight pulls at Oakley. I have to agree with you there, it looks like it is terrible on the tractors.
If someone out there has never seen a competitive cement surface dead weight pull; Picture the following. A tractor is chained to the sled and the engine is revved up to an over speed condition. The driver then drops the clutch and the front of the tractor rises to a 45 degree angle off the ground. The driver then works the differential brakes and clutch in an effort to get the rear tires to alternately leave the ground in a right-and-left fashion. Once this has been achieved, the driver then uses the brakes and clutch to get both tires to bounce, slip, and grip simultaneously. This transition from right-to-left to simultaneous slipping is the tough part, and it may take several tries for the driver to be successful.
The front end of the tractor then works like a pull hammer as it swings up and down through a 20 degree range as the driver keeps the tractor bouncing with the clutch. This action then scoots the sled down the track. Obviously, these tractors MUST have wheelie bars.

No wonder they're in the middle of a corn field. Nice looking 400