I'd throw a set of Firestone bags (around $120) in the rear. You can easily adjust for that small of a trailer with 10-20 psi in the bags. You'll need to pull the rear coils, cut down the isolators, install the bags, and run the hoses, which is a few hours of work but not overly complicated. I run them in my GX470 and they leveled out a 5,800 pound trailer. Presumably you are going to have a compressor with you anyway, but if not they can be inflated with a bike pump.View attachment 4000951
Here's the setup as towed - the back sags a little more than I'd like, but for one trip, I didn't really feel like modifying the suspension. I haven't had any issues with sway after 800 miles of highway driving, but still contemplating a WDH. I've got a few weeks to make that call - I'm mostly concerned with fatiguing the rear suspension. I don't have a tongue weight, but weight is as evenly distributed across the axle as I could make it.
A WDH setup is great for a big trailer, but is a pain for daily use and will cost a lot more than bags. I can also see the arms, chains, etc. getting caked with ice/snow if you are driving it in winter conditions. At that point it might preclude unhooking from the trailer.
Just FYI, I totally trashed a set of Ironman coils on my GX after towing our camper about 2,000 miles. They were initially fine with the bags at 30 psi, but I ended up needing 50 psi to level the rig and more or less ruined the bags in the process. So, it's certainly a "real" thing. My camper was probably much heaver than that small enclosed trailer. I now have Dobinson's variable rate rear coils - which did great with the 5,800 pound trailer and 30 psi in the bags.