Will these side skirts block access to my jack points?

No. The GT Concept design maintains clearance at factory jack point locations, so you can safely lift the vehicle without removing the skirts. Verify your vehicle's specific jack point geometry before final installation.

How much ground clearance do these add or remove?

The GT Concept profile extends the rocker line outward without adding significant vertical height. Ground clearance remains essentially unchanged. If you run a lowered suspension, dry-fit the panels to confirm clearance at full compression.

Should I sand these before painting, and what prep is needed?

Yes. Sand the surface lightly to ensure paint adhesion, then wipe clean of dust before applying your chosen primer and topcoat. Your paint supplier can recommend the right prep steps for your specific finish system.