Side Slope Measuring Device?

[MisterE]

Hi All,

I'm a novice to 4 Wheeling, as I've said in my other threads most of my other threads my off-roading has been in Dune Buggies which had a super low center of gravity and extra wide wheel base. Well I'm very happy with my H3 but it is BIG change! I know that manual says it can handle a 40% side slope and I am getting ready to go back up to the Sand Dunes. Is there anything out there (other than the good old eyeball test) that you can add to your HUMMER that lets you know when your getting into the danger zone as far as the side slope?

Sorry for the newbie question!