Your Expy is on a 1/2t chassis which limits the payload and tongue weight more than what it can actually drag behind it. Your GVWR minus actual vehicle weight will give you an idea how much can be loaded in the vehicle along with the tongue weight of the desired trailer (toy hauler).
Expect that the tongue weight will 15% of the GVWR of the toy hauler you are eyeing. If the toy hauler is rated at 10,000 lbs, you will have close to 1500 lbs of tongue weight once you are loaded with water and propane.
In general, you need a 3/4t or 1t SRW vehicle for a bumper pull toy hauler. There are some smaller lighter units, but you will need to watch the tongue weight more than anything else when you are looking for one.
