Skid loaders are designed to have 70% of the weight on the rear axle empty and 70% on the front axle with the bucket full. That makes the 30% axle, front/empty, rear/loaded, skid around the 70% axle. That 5,235 is probably with the bucket (it's the listed operating weight--can't operate it without the bucket). That means about 3,500# of the weight is over the trailer axles and 1,500# is 36" forward of the trailer axle and probably 7' behind the hitch of the truck. So 650# of the loader's weight is contributing to the tongue of your trailer--which with the spindly looking A-frame and those big ramps means you have maybe 750-800# of tongue weight there. Just an experienced guess.
Put the loader on there backwards and run it as far back as it can go and post a picture.