The double-roller install wasn't a problem for me. I had my pump ground down from Rick @ Synergy when I bought it (he does this - I think TSP and HRI may do this as well). I used the spacers that came with the Rollmaster. Everything bolted down no problem. I didn't have to grind the front cover. I did have to bend the pickup tube a little to get it to reach. Then you have to double-check to make sure the pickup isn't too far away from the pan.

I used an install tool, which helped line everything up.

But I understand that may not be the norm and all the extra and time consuming aspects of it may not be great for business. So I could see a shop wanting to go with a single roller.

 

Not just a shop but most novices also. Different timing setups may even make you grind the front cover esp if using an aftermarket pump OR using a dry sump setup. Cant space a dry sump pump as it has to fit onto the gasket on the pan. So still more need for an hd single.
Failures happen all the time. The why and the how are usually not clear though. Installer error likely causes more than we would like to admit.

 

I agree. A nicer HD chain setup is needed. I went with the DR because of the added strength. I also added the Katech Chain Damper for the LS6 and use an ATI Superdamper Pulley. I really don't want my chain breaking.