Check out Dynaslide at
They have slides from 50# capacity and 10 in. long to ones that have hundreds of # capacity and very long.
I just made a batt. tray (sized for two Trojan T105's that weigh about 125#) using their 200# capacity slides that were 12 in. long.
They maybe stocked/ordered through one of your local Cabinet supply companys. They will be much less expensive than CW/Kwikee etc.
2005 Dodge, 2500, auto, 2wd. Pac brake PRXB. CB, Max Brake Brake Controller, Rhino Lining, Aero 60 gal. replacement tank.
1998 Hitchhiker ll, mod#31RLBGBW, RBW L'tl Rocker Hitch, Generac NP50 G generator