Question about trailing arms ,nascar set up?

What is the purpose of the bar that attaches the 2 trailing arms?

If you mean the one at the rear attach point, it just acts as a brace. Doesn't really accomplish anything other then adding weight to the suspension.....

I was looking at the pic also and it seems the shocks are leaning too much and should of been placed a little further out. :confused:

Yup. I've seen a lot of people mount shocks inboard, I suppose because it's more convenient. I like mine as far outboard as possible, must be the old dirt tracker in me or something.....