CG and Weight Question

Artum Snowbird wrote:
It goes like this. Assuming your wheelbase between your axles is 12 feet. (I know it's not, but this makes it easy to understand.)

You have lost 320 pounds 12 feet ahead of the rear axle. You have likely gained 640 pounds 6 feet behind the rear axle. You see how the weight times the distance is the same in each case.

CG marked on campers are for a dry measurement only, but once you fill it with your stuff, in your case for sure, you have more weight behind the real axle than in front of it.

So again, assuming 144 inches to the front axle. Moving the camper forward 1.44 inches will only take off about 1/100 of the weight on the front. Only 3.2 pounds.

What you have to do is shift significant heavy things from the back of the camper to the truck if you can.

Your math is a bit off. Moving forward will put more weight onto the front axle and the amount will depend upon how far behind the axle the COG is at the start. We do not have enough information to determine that but I'll take a guess:

Let's assume the camper is 4800 lbs. 4800 / 320 is 15. This means 1/15th of the camper's weight is removed from the front axle. This in turn means the COG is 1/15th of the wheelbase distance behind the rear axle. Using your 144" assumption that works out close to 9.6" behind. So in that case moving 1.5" forward would restore about 50 lbs (320 * 1.5/9.6) of the 320 lbs originally lost.

For what it's worth, losing a little front axle weight is not a big deal. Camper loading guides provided with the truck will likely show an acceptable COG range in front and behind the rear axle. Past GM publications I've looked at only were concerned with the front and rear axle loading ratio as a percentage of each other.