Mobilelife RV in Kitchener is showing the Roadtrek lift assist as available on their website, but I know from past experience some stuff is shown but they don't actually have any. It is listed as for the short Sprinter so the wheel mount would have to be modified for the Chevy wheels, as would be the mounting to hitch receiver.
https://www.mobiliferv.ca/rv-parts/r...h=tire+carrier
Looking at the pic I put on an earlier post, this pic, and the video it looks like there are 3 quite small diameter pulleys. One at the bottom of the vertical tube to turn the cable to the front of the van, one at the bottom of the "tower" and one above that pulley at the top of the "tower" that turns the cable back to a connection on the vertical tube to pull it up from the lowered position.
The listing shows it for 2010 and up Short Sprinter so this is probably what Tarp has on his 210 Simplicity but in a Chevy configuration. IIRC his is a 2011. The cable and pulleys would be hard to see if you weren't looking specifically for them in the right places.