Traction ideas???

Mopar Sam said

The motor also sits a little farther forward in these Sweptlines than in the later trucks. I do have room to go back about 3/4". I don't know if it is worth it though. I would need to make mounts for motor and trans, plus probably shorten the drive shaft.

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I very much doubt that little bit of rearward move would be worth the time and effort. Moving the battery into the back of the bed would make more transfer of weight. Especially if you use a group 27. You would need a battery box, I think, and a shutoff if you are gonna race it. Probably not a "budget" option.
I'm assuming since it is a step side, a solid tailgate. Otherwise, a dirt cheap and simple: waterproof a hollow tailgate, and fill it with water. Make a drain, and you could add or subtract as needed.