I've done a fair amount of wilderness camping / fishing but in the area closer to north of hinton ( wildhay / berland rivers ... ) , there are some good forestry maps available , closer to the rockies I found most of the old trails were closed off to vehicles , some for horse riding / hiking only , they have some cool history like famous(?) early settlers cabins and even graves in the rock lake area ...
grande cache used to run jeep jamboree's and have a fair number of members who visit the edmonton jeep club website along with grande prarie wheelers ... also try posting at
www.edmontonjeep.com or missioncontrol.ca ( eco site ) ...