Truck Alterations Access Abbreviations?

I am looking at getting a tonneau and looking at truck alterations site:
http://www.truckalterations.com/html/tacomaworld.html
and i see the following abbreviations:

LOR
ROLL
LIMIT
LRIDER

What is the difference between LOR and LRIDER? Is the vanish no longer available?

 

LOR is for loredo
ROLL is...I dunno
LIMIT is for LIMITED
LRIDER is literider.

Personally I couldn't justify spending more money than just the literider. It seemed to have the best value. Sure the higher end models have the fancy adjustment knobs and stuff, but honestly I adjusted mine when I first installed it and never adjusted it again after that.

 

That makes sense. I have read just about every thread involving these covers and did not see the abbreviations explained and figured it would probably help someone else out.

anyone know if the vanish is still available?