Well from watching the level up system operate scores of times it looks like the weight is fairly evenly distributed when leveling and it is a static load not weight bouncing around on the rear of the camper only. The rear 4 jacks all come down at the same time. The good thing is I will bet his pin weight was light. Don't know if that "stuff" was a contributing factor but it may have been tempting fate.
I mean my 06 3400 broke with nothing on the back.