Thor doesn't make any "bad" RV trailers, so the Z-1 is probably comparable to any other good brand of TT.
But your problem is they are not light weight. The lightest one the 21 footer model ZT211RD with GVWR of 7,522. The other end of the scale is the 30 footer model ZT301BH with GVWR of 9,688.
If that 1500 CrewCab 4x4 is your tow vehicle, then even the smallest Z-1 with a GVWR of 7,522 will probably overload your half-ton tow vehicle. Your heavy CrewCab body and 4x4 drivetrain use up most of the available payload, leaving not much for trailer hitch weight.
My half-ton tow vehicle is overloaded with a TT that has a GVWR of only 5,600 pounds. When loaded to a gross trailer weight of 4,830 pounds, I was overloaded by 100 pounds over the GVWR of my tow vehicle.
So I'd suggest you do some research as to the max unused payload you have before you tie onto the trailer. Towing overloaded is common, but not very smart. So determine the max tongue weight you can tow without being overloaded, then don't buy a trailer that has more wet and loaded tongue weight than that.
Best way to get a good estimate is to load the Ram with everything that will be in it when towing: driver, passengers, pets, tools, jack(s), weight-distributing hitch, other stuff. Go to a truckstop that has a certified, automated truck (CAT) scale and fill up with gas. Then weigh the wet and loaded tow vehicle. Subtract that weight from the GVWR of your Ram and the answer is the max wet and loaded tongue weight you can tow without being overloaded. Divide that max tongue weight by 0.15 and the answer is the max GVWR of any TT you should consider buying. And I'll bet the answer is a lot less than 7,522 pounds GVWR of the smallest Z-1.
Ignore "dry" weights, which are almost meaningless. Use the GVWR of the trailer as the probable wet and loaded weight of the RV. Use 15% of the GVWR of the trailer as the probable hitch weight of the wet and loaded trailer. Then you will have a pretty good real-world estimate of what you will look like when you weigh the rig in the middle of your third camping trip.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.