axel mount best off road
Attaching at the axel provides unsprung weight to the bike. Any attachment to the bike subframe or frame will be sprung weight. I would think a low unsprung weight would be more stable off road, not changing the weight bias of the suspension fore and aft.
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'11BMW R1200GSA '08KX500 S.H. AFC(my favorite)
'08KFX450R quad '07KLR650 '04KX500(tagged) '97CR500R '76KT250(tagged)