I installed a 2 post in April, love it makes things much faster. For ground clearance my minimum situation is 3 3/4 (Cobra kit) I can do that without boards, but it is a push to get the pads under. The biggest issue with an AD would be the running boards as the arms are at like 4 1/2 inches. Mine,s a Derek Weaver 9K and I would buy from then again. As a matter of fact, I will buy a 4 post post from them in a couple of years after I raise the roof 6 foot.
Rob
