I just went through the same thing on our '08 Endeavor. There are no releases on those heavy duty glides. You have to pull the batteries, pull the tray as far out as it will go and then remove the bolts securing the gliders to the bottom of the compartment. Last you have to pick up the whole assembly and lift it out. I found that many of the small screws securing the glides to the tray were corroded to the point where I couldn't back them out. Had to drill them out.
2016 Winnebago Journey 40R - 2012 Jeep Rubicon
2 Arctic Cats, 3 Shelties, 4 cats
Bottle of Jack Daniels & wife