just wanna say, love this mod use the land rover for most kerbin based ground missions, lookin forward to havin more vehicles to choose from :).i have made my own version of this http://gtaforums.com/topic/716444-benefactor-dubsta-6x6-appreciation-thread/page-5 using your mod. so 4 wheels in normal attachment places then addin 2 wheels jus behind the front one, on to the door then lowered with offset tool to line up, and then i put 2 infront of and 2 behind the rear wheels then again lowered with offset. it works like a charm because the extra 6 wheels are attached to the doors (even thou they are ofset close to the wheel arches) and stick out it makes for great stability even with the heavier science experiments on top. i try nt to use it on eva missions as the doors are blocked ( but can still get in and out).
however i have noticed jus one issue, this may be down to unity and ksp wheel bug ( which is apparently been worked on for next update) but if a kerbal is walkin near the vehicle and touches a wheel he and the car go flyin, normally endin in the car been upside down and unusable