Drag type bale accumulator suggestions.

I am getting ready to build a small square bale accumulator that I would like to pull behind my baler but would also like to be able to pull it behind a ATV or truck if need be. So with that said what type of drag accumulator seams to work the best one that the bales drop out of the baler into the accumulator or one that drop bales onto ground and then go into the accumulator. Just looking for people that use them and what to good and bad if each is.

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Drag type bale accumulator suggestions.