It also has to do peanut butter to jelly ratio, if you got too much jelly, you'll never stick to the ground, too much peanut butter and you're dog gets tired of lickig off!
What about bags on the axel? Is that ok or not with the satchell? Where would you put the bags?
Yes you can place the bag on the arms. I would probably mount them to the upper arms that are parallel to each other. Or you can set up a rear cantilever/shackle set up like they do on S-10's and that would keep the bag lower on the suspension