Center of Gravity

Because CA often does not let you remove the camper from the truck and I like to go into nature, I thought I needed to look into a pop-up. But then I noticed that some hardsides have the same or similar center of gravities as pop-ups. Not all manufacturers list this, but some Lances have the same COG as a Hallmark I am looking at (36 inches), and others Lances are only slightly higher (38 inches). Am I correct that COG is THE issue with regard to tipping over. I plan to spend some time on forest-type roads that are often well short of horizontal (but nothing crazy). Also, how big a deal is a 2 inch difference in COG? I know another issue is height and staying under trees, but I don't think this will be an issue for where I want to go, and I would definitely prefer the extra room of a hardtop. Thanks.