Originally Posted by surfmobile
Is the hardware a cinch to replace water tight?
Yes. ...and I would use 18-8 stainless hardware when replacing...the butyl tape is readily available from McMaster. I also used stainless sealing washers available from Mcmaster for further robustness.
The above would be an improvement of SMB west's work from the tops I've played with.
Removing/Replacing the hardware should be an easy job...you'll need access to the roof topside and the inside the van on the underside; likely two people to get everything tightened up.