based on price, capacity, etc. i have narrowed my lift selection down to two. both are priced within $50 of the other. one is the bend-pak hd-12. my concern with this one is it appears that the lift mechanism is underneath the tread and on only one post. the other is the fp-12 made by american automotive equipment. it's lift mechanism seems to be like that which i've seen on other lifts...the hydraulic ram on top pulls a chain or cable and the lift rises. what are the pros and cons of each design. the information on the american automotive website doesn't offer much detail. i have links to view both below. i would appreciate any opinions on which to choose.