i have them. bought the alu cab 360 from mule outfitters in pdx, with brackets. once i got atc camper, i took it back out and had them install. they are super sturdy.
my only beef, is that the 3 bolts that attach the mule brkt to the camper jack brackets, are also the same bolts that attach camper jacks - soooo, when u want to attach camper jacks, i jury rigged a 2 x 4 to support awning, whilst i bolted the camper jacks on.
i could send pics of mule brkt in place if that would help. jacks are off.