I would trust your truck to handle the same weight as a single tire 3500 is rated to tow.

The tires brakes and axles are all up to the task.

The coil springs may be a little soft and you can always add airbags.

I have them on my truck and I love them, I don't tow as heavy as you will be either.

If I were you I would get airbags and do my calculations off of a 3500 single tire, but that's just me.

This is not legal advice.

If this is something that is going to worry you and be in the back of your mind every time you are trying to enjoy towing your camper around trade your 2500 for a 3500 and be done with it.