Thanks all- It is single axle (Pace American is the brand)-
I was able to remove the old plywood from the ramp and install 1/2" plywood- (had to use the self-tapping screws)- Looks and feels a bit more sturdy- I was able to ride my 46" riding mower up and down the ramp with no issues- it is an old trailer but on the tongue it states gross Vehicle weight is 2990lbs so I would think golf cart is ok (electric)- I may just put another layer of plywood over the original wood floor to give some added strength- (I would replace the whole floor but it looks like the outside walls sit directly on the floor which to me looks like a lot more work!