Chris, I presume that the tire pressures you quoted were the pressures for the trailer
tires. I normally run mine aired to max pressure or near max pressure. That will give a little stiffer ride, but gives the sidewalls maximum stiffness and will keep them from generating too much heat, the killer of trailer
tires.
Second, make sure your tow vehicle
tires are also aired up to near max, especially the rear tires. I typically run with the front tires a little softer for ride, as without a WDH, they're not carrying much extra load. The 300 or so lbs of the trailer tongue hanging cantilevered out over the rear
axle though, is a significant additional load for the rears. Inflating them to max psi or near max psi will allow them to safely carry the additional weight, and will also allow for less sidewall flex.
The combination of having the tires properly aired up on both the trailer and tow vehicle will cause the trailer to track straighter, and not allow the trailer tongue weight to be able to move the rear of the tow vehicle (known as rear
axle steering) as much going down the road which will contribute to a much more stable feel.
I don't carry a significant amount of additional weight in my Scamp either, however I do typically store and carry a computer briefcase
weighing about 30 lbs in the shower pan. Tow the trailer level. The tongue weight with the tandem LP tanks full and
battery should be about right anyway.
Please let us know what you figure out!
Roger