well that seems to be what mine did too
my hitch is curt with anti sway bars 600 pound ones(trailer is light 4100 pounds dry.
think about the total weight at each axle front, rear
front axle heavy ie engine their :) rear light . ie no load
ok hook up trailer rear loaded, ok so now we need to find a good
balance of front and rear axle weights ie too heavy on rear front steering feels soft and floating so to speak \this is not good for breaking/ stopping / steering ..if you cant steer or stop quickly if the balance is off.
i set mine up with my trailer loaded and water in the tank
also you want a little sag in the rear( truck) so to speak..
the trailer tongue needs a little slope down.. is if it's too high you get wagging trailer (sway back and forth )
just trying to help,,, also my English is bad .
and to add another wrench in the mix i have air bags on axel. i put just enough air in bags for contact of the stubby leaf spring
( truck has 3 leafs 2 long ones and stubby one that their for weight in bed) factory springs.
also i have it set up to the level on the trailer bubble just sloping towards the truck a little.. think about leveling a site for fridge example you want to be in center of bubble well towing i want a little towards the truck on the bubble. = no sway :)
hope i helped, just things to think about.