How about some scale numbers.
The forum can give much better advice on what to do when we know what you really have.
Load up ready to go camping and visit your local CAT scale.
As said you will need three trips across the scale and make sure you get each axle when on the scale.
This can be done on a single bed scale if you get weights as each axle is added to the scale bed. But still requires three trips and a total of 8 scale readings. I do 10 readings my self as I do each trailer axle to make sure my tires are OK and if the trailer axles are sharing the load.