I found this video recently about DIY wooden full extension drawer slides. Pretty kewl easy build. I think it would work for anyone building storage drawers in their rig. Ill leave a link below, video is a desk build, but can be adapted in size etc to other apps. Built of a quality hard wood it should be plenty strong if drawer was suported fully when closed, so it didn't ride on slides when traveling. Just an idea.
https://www.youtube.com/watch?v=eaS7RCueS8Y