For my 1015 ShelterLogic garage, could I redo the ratchets to pull the canopy taut again? And are there any additional parts needed to make it snow load rated?
You may have to reinstall the ratchets and top completely to get taut enough again. This would just be a trial and error at the first attempt. If something was "snow load" rated it usually means that there is an additional brace on the frame to keep the top from buckling with additional weight.