Generator tray sliders

[transit360]

Where can I buy some heavy duty sliders that'll support and 100lb+
generator that I'm installing. I'm gonna make my own tray to fit the
generator, but I need some sliders to make it more serviceable.
My battery tray has sliders on it made of metal wheels that hold
two 8D batteries, so they would be great if I could find them. Where
can I get them??

Steve
2 '98 QBRE Partybuses