Happijac failed while driving down the interstate!

abslayer wrote:
You are talking weight of truck front and rear.

To figure weight on jacks it would have to be with camper only.
And how one would figure that I don't know.

If you look are where the jacks are in relation to the rear axle of the truck (where the camper COG is usually close to), you'll see that the front jacks are probably much closer and therefore carry more weight than the rear ones.

This may not be the case with 8' or 8.5' long campers on long bed trucks but is with 9.5' and larger.