it was because you had a load in it.....
if ya want to make it that way most of the time....get some treated lumber and make a box sorta like an "H" between the wheelwells in your bed, then get a couple bags of "traction sand" at a Rural King or Tractor Supply Store ( not sure if Lowes or Home Depot have it )
then ya have a little weight in the rear....and when ya need to haul something...take it out
l8r, John
Theoretically the best place for weight is directly over the rear
wheels, but there are other considerations, like where that
weight is going to go in the event of a collision....
With that in mind put the weight against the headgate
(the forward bulkhead of the bed)
I carry a weight there in my truck most of the time.
what weight do I carry?
First hint: Liquids are dense.
Second hint: Liquids can easily be pumped out when
you don't want the weight.
Last Hint: Water Freezes, I use a luquid that doesn't
freeze under any conditions on earth.
I mounted a 40gallon gas tank against the headgate of my bed.
Makes the ride real nice.
But I'll note that with ALL my fuel tanks full the truck
feels a bit "dead" when you are trying to drive spiritedly
on a twisty road.
Particularly if the 21gallon tank behind the axle is full W-a-y back there it doesn't do good things for the truck's polar moment of inertia.
But it does make thins stable ona long highway trip, particularly in crosswinds.
AD