On Tuesday, December 12, 2017 at 3:37:41 PM UTC-5, justan wrote:
I put together a 1720 lb rated Harbor Freight folding trailer.
Approx 300 lbs
On it, I have a 1050 lb golf car.
Tongue weight is 108 lbs with the car as far forward as I can get it.
Some say the tongue weight should be 10 to 15 % of total. Others
say 5 to 10 %.
Let's hear your opinions on the subject.

If you don't have enough tongue weight the trailer may be more likely to sway. You're pretty close to 10% so I'm betting you'll be OK. Take it for a spin and keep a close eye on it.

Have you tried the golf car in both directions? The rear end could be heavier and backing on the trailer might do just what you need.