I had the same problem, as the condensate has a little bit of a trickle it will freeze. So what I did was place rock salt into the condensate drain line and the trickle now has a touch of salt in it and does not freeze.
You have assembled the lift wrong. There are 2 sets of locks one manual and 1 sets up if a cable breaks, looks like you have the cable safety brake on wrong
Just ad vents to the gable ends. One can even put a thermostatically controlled fan in one end. I have 16x16 vents in my pole barn and no condensation.