any experience with this baja rack?

http://www.trdparts4u.com/PD-BR-MULE.aspx?MakeID=1

am i ready it correctly that it'll work with the factory roof rack or on the bed rails or both?

whats the max load capacity of the factory roof rack?

 

Seems to me that the max load weight for anything on the roof is 250lbs - which is a sh*tload!

 

For the Tacoma they specifically say the cargo crossbars. So not directly on the rails.

Here's a picture of the clamp (looks like it would just sandwich the factory roof rack):



And here's some instructions for installing it. Maybe you can tell if it would work from those:
http://www.discountramps.com/cargoImages/Mule-Instructions.pdf

You might check out the pricing on that (Regular $295 On sale for $350?) I'd call and see if it's a price mistake. The MegaMule is only $7 more. My guess is it's supposed to be $250.
http://store.rampconnection.com/product.php?xProd=7433 ($290 + $30 s&h)
http://www.discountramps.com/baja-cargo-rack.htm ($290 +$60 s&h)