Thats how are is - if it is a super coupon they won't let you use the 20% off. One coupon per purchase. Now if it is just in the flyer on a "sale" (like everything pretty much) then the coupon will work.
I looked at the lift and for the money it does look really nice. I also was looking on line at some and then started looking at scissor lifts and a "quickjack" (QuickJack - Portable Car Lifts and Car Jacks for your Home Garage or Shop) lift. Started thinking I could get something like that and use if for more things. I don't do much "real" auto work as we are lucky to have newer cars but oil changes, tire rotations, brakes, etc would be a bit easier this way. I figure I can make a "table" for it to hold the bike as I only have a dirt bike and am looking for a Trials bike so they are super light. Also thinking it would be handy to lift the Mule for service work so I am now exploring other options.