What is the Jeep Wrangler roof rack weight limit?

It depends on your rack system and where it's attaching to. But the quick answer is over 150 lbs wen the vehicle is in motion.

Should I get a drill or non drill roof rack for my Jeep Wrangler?

You're welcome to read the section about this topic above. It depends on your needs when it comes to weight capacity, and if you're handy with power tools.

Does the Jeep roof rack storage capacity change?

Depends on the rack and weight capacity, but most Wrangler roof racks can carry from kayaks, to roof top tents, gear and luggage. Check the dimensions of the rack, the weight rating, and that's how you can determine your Jeep Wrangler roof storage.

Should I get a platform rack, a half rack or crossbars for my Wrangler?

Crossbars are great for boards or kayaks, full platform racks for larger and heavy items, and half racks allow you to easily remove the freedom panels.