Why did you choose those tires for that application? Are they radials? What profile? what maximum load?
If you did enough research to indicate those tires were the right choice, how did you skip inquiring about the best pressure for that tire in that application.
You might consult the B pillar on a truck for which the tire was designed, then make a sane estimate.
Or you could take the advice of those who advocate dangerous minimum pressures.
Tire pressures are properly related to the right tire in the application for which it was designed. Deviation requires research, understanding or risk.
Assuming it is a typical LT radial with a 75 profile and a 1700 pound rating... Run them tight for your Scamp16. A few pounds shy of 65psi should do no harm, but not more than 10PSI.
Do you know the weight on the
axle and whether it is evenly distributed.
Example...
If it is 2600 pounds on the axle with 15% weight difference side to side, you are approaching the maximum load on one side at least, requiring 65PSI.
Suppose the load is evenly distributed leaving 1300 pounds on each tire with a margin of 400 pounds to the weight limit at 65PSI.
Tires should run the same pressures on the same axle.
Not doing the math or knowing the particular tire, it is safe to assume that dropping the tire pressure to 55PSI may well result in reducing that limit to or below 1300 pounds.
I disagree with those want to run without any margin, but that is ultimately your responsibility.