I have a Bend-Pak 10,000 lb Asymmetric 2 post. I have used it for 10 years with no issues. It has a car or truck on it 90% of the time and has no problem lifting my Dually crew cab. As far as concrete I poured the shop floor with the intention of installing a lift.

70 Dart Swinger, 2850 lbs
SB 408, Bullet roller 264/268 @50 .636 SSDS stage 2 Edelbrock heads, 1 7/8 Headmans, 1050 dominator by Dom, 9.867 @ 133