Will this fit under my car without jacking it up?

At 17.5" height, it slides under most vehicles at stock ride height. You may need to raise lower-slung cars slightly, depending on ground clearance. Test-fit before committing to major work underneath.

Can I adjust the height once I'm already working?

Yes. The height adjustment is designed for quick tuning while you're on the seat, so you can dial in comfort as you move between jobs or sections of the vehicle.

Does the base lock in place to keep it from rolling?

Rolling base allows you to move freely across the work area. If you need to lock wheels in place for safety, verify the locking mechanism before you buy — contact support for exact details on wheel locks.