The problem is you are working with a poorly designed toy hauler. The axles on that model are at the very front of the garage so none of the garage weight can be transferred to the pin. This is why most toy haulers are 3 axle.
The RV companies trying to do this with 2 ales are constrained by the fact that the trailer has to go down the road with proper weight distribution when empty and when loaded.
Like others have said you can try to back the side by side in putting more weight closer to the axles and less on the end of the lever lifting weight from the nose.