I took a stock Jeep for a spin on Whirl Wind track with complexity and vegetation turned off for  me to easily view the naked terrains and measures how it goes for normal off-roader to pass through.  The elevation is quite high and few deep pit spotted could trap in at the foot of every odd hills, a normal SUV size vehicle would stuck and seize stationary as decent into the pit.  I think i would have to re-trim the overall terrain especially surrounding existing hills.  For the sky bridges it seems to work very well at elevated heights and no problem for oversize MAXXIMUS to pass through.  Thankfully i use VRC USB kit hooked to FM frequency R/C controller for smooth driving and simulated rock crawling feeling.