What study or data are you referring to? A lot of these reports focus on initial ownership experience, measured by returns to the dealer during the first couple of months of ownership. Most of these returns are glitchy electronic issues - like those being experienced by many Grenadier owners right now. Most Grenadier owners love their vehicle despite these software problems. Is the Grenadier a "bad" vehicle because of its current glitchy software?
Its hard to get good data on the kind of issues that really matter to owners. Of course, what really matters to people will vary, but in general, people want to know the following: Does the vehicle always start? Does it leave you stranded? Does it go into limp-mode for no good reason? And other things like that. So that is why I'm curious about your source. Also, the Wrangler gets lumped in with all other Jeep models when Jeep is evaluated, and the Wrangler has always been a more reliable platform than other models (Liberty, Compass, Grand Cherokee, etc.).
Another problem with these reliability reports in the truck world is that fleet vehicles get abused, and those problems get lumped in with the brand. Here in the U.S., heavy-duty working fleets are made up of Ford, Ram, and Chevy pickup trucks. These vehicles may be run all day long, because workers want to keep the heat or air-con running, and they get run with heavy loads, and maybe pulling heavy trailers. There are no heavy duty Toyota trucks in the U.S., so they are not found in any fleets, suffering the same level of abuse. This is definitely a confounding variable in comparing Toyota reliability to the big three American brands.
I've been driving 4x4s since 1985, and I've owned a heavy-duty Ram diesel, a Jeep CJ and JK, Toyota Landcruisers, pickup trucks, and 4-Runners. The Toyotas were a little more reliable with fewer repair costs than the Jeeps, but not by much. None of them were "problem" vehicles. But that's just one guy's experience, and I keep on top of all required service, and I halve most of the service intervals because my vehicles are regularly driven off-road (hot & dusty, water crossings, lots of steep rocky terrain) and regular on-road driving is over high elevation passes that are hard on a vehicle.
According to the 2023 JD Power rankings in the U.S., Jeep was #18 in 2023, while LR was dead last.
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- Pepper's conclusion:
TM diesel with roobar, brush bars, side runners, roof bars, cargo barrier, 2 drawers, fridge, 180 awning, No winch.
My guess is Ineos is not providing payload weights for the Trialmaster and Fieldmaster variants because they are (hopefully!) in the process of making changes based upon all the excellent feedback on the initial releases courtesy of this forum and other owners for model year 2024 and beyond. In other words, the payload for those trims (and perhaps even the base Station Wagon) is a moving target right now. 
