I also couldn't get this solution to work. But this alternative one I made worked perfectly for the convoy. Getting the first ramp set perfectly is very difficult though. If done correctly, then they'll jump over the lasers. https://sp.zhabite.com/id/McBr0/screenshot/2118440598851613841/

If you built a good solution, post a link to a screenshot here and help others stuck on this level even better than the screenshot in the guide.

for single drive this is still OK but for convoy minor adjustments to support in the middle and length on the endmost piece are required.

oh ok thanks

Many levels have been changed slightly since this was published.