Sounds like you have a Class III hitch.
Class III Hitch Definition:
Class III hitches are weight carrying (WC) and also are weight distributing (WD) depending on the vehicle and hitch specifications.
Not all Class III hitches are rated to be both. See the specific hitch for that information.
Class III hitches used as weight carrying are rated up to 6000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 600 lbs.
Class III hitches used for weight distributing are rated up to 10,000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 1000 lbs.
A Class III hitch usually has a 2" square receiver opening.
A higher class drawbar does not increase the towing capacity of the hitch. To use this class of hitch for weight distribution requires a weight distribution system.
I don't think you will be happy with the performance but I think you can pull the trailers within spec with a WD Hitch. AS others have said it is not a pleasant drive once you are past the 80% or capacity limit.
I drove to FL from NM with a 90% of limit set up. We made it ok but if the wind was blowing wrong we just stopped and waited. A cross wind with semi truck traffic got very wobbly.