That's a big duh on ramps (I've used half width CMU (concrete masonry unit) aka "cinder block"; something that hasn't existed in almost two of my lifetime yet people still use the term.
Kind of like 110/220v. Something that hasn't existed in USA residential since just about 90-100 years ago yet a majority of boomers will use that term they apparently leaned from their grandpa.
Back to topic:
No mention in the TIS of prep for tighten so it's all good to do with the wheels hanging. Might be slightly better with the weight on the jack points vs. the center axle lift.
The bolts are torque to yield. Single use: if you want to reuse them you can probably just use half or ²/₃ the angle to not actually yield the bolt. Or you can get 12.9 bolts like I did.