That was long time ago, but from my memory it was 5th grade physics how the lever works.
I know the "hands on experience" guys don't remember much of the school, so let me make quick sample.
Mine F350 is long wheel base, but my guesstimate for long bed, short cab F250/350 the wheelbase is about 9', while the standard hitch come with the ball 5' behind rear axle.
So simple sample with 4' extension will make the trailer ball 9' behind rear axle, what in this sample will equal to the distance from rear axle to front axle.
So having 1:1:1 lever the tongue weight will take equal weight off front axle, meaning the rear axle will carry both - the tongue and cantilever weight.
The 700lb tongue weight will add 1400 lb to the rear axle.
Add that close to 100% of camper weight will go on the rear axle, makes 3400lb.
Add truck own rear axle weight (around 3000lb ?), so what is the total?
