oohhh...I can answer this question. The M109 will tilt only as far as it takes to tip it over. Then you'll know youve gone too far lol...But seriously though, just use common sense. If it feels like its listing too far, dont go that way. It may have an angle that it will generally go over at, but you may have more gear stowed in your van, or more fuel in your tank, or less tire pressure in your tires then the truck they tested the angle out on...plus forward motion will add to the weight being tossed side to side when your suspension travels. i.e. if you know the 109 will tip at say 60 deg when standing still, whos to say she wont go over at 49 deg because you hit a bump and flung weight above that center of gravity....