I prefer a 4 post lift.
A friends car fell off a 2post. The one shown might not actually hold 2 kayaks, safely. At least they would say so at work.

: I have discovered the new must have tool for kayak building and
: with Christmas coming thought I should share! It is built for
: taping that interior seam. No more bending and squatting, just
: touch a button and raise and lower to any comfortable height!
: What? you overbuild your boats with 17 layers of 12 oz glass? No
: problem she's rated to 9,000 lbs and you can do two at a time!
: TB