I use a 3/8" stud that is screwed into the battery terminal and then a nut to hold the cables on. That way you don't have to worry about the bolt being too long or too short. But of course this usually requires a little more clearance around the terminals and if yours is set up like my truck there is not a lot of room.
Regarding grounding the battery to the frame, i would think it would be easier to run the couple of feet between the battery and straight down to the frame versus running a cable all the way from the back up to the battery.
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