None of the vehicles you’ve listed are exactly low-maintenance units. They all have complex all-wheel-drive drivelines (which will be appreciated when towing a heavy trailer across a wet showground) and they use the latest common-rail diesel technology which is fairly intolerant of poor servicing. As for a power tailgate on a ute, I’m afraid you’re out of luck. But some of the wagon versions of these vehicles can be optioned with powered tailgates. The catch there is that these vehicles use coil sprung rear axles (as opposed to the leaf-sprung ute versions) so they’re not as adept at towing. The Toyota Fortuner, for instance can’t match the HiLux’s 3.5-tonne limit and makes do with 2800kg; not enough for your requirements. The Ford Everest (based on the Ranger) is a little better at 3000kg, but still trails the Ranger’s 3500kg towing capacity and is right on your self-imposed minimum.