Hook up a decent trailer and a hybrid is nowhere to be seen and the diesel far better. Here they were selling 1-2% petrol, the rest diesels to the point the petrol was cancelled, even in the lexus (which has the diesel too). Go to the middle east and where there is cheap petrol, the 5.7 sells ok. In the deserts, the diesel is still king.
It's a bit different here in the US. Diesels are generally the efficiency option. Rather than the performance option. While diesels make a ton of torque, they don't make enough HP for the type of driving we do here. Which is lots of high speed freeway, with potentially lots of mountains and serious grades depending on where one lives. Both require more HP than they do torque. Torque at the wheels can had with more gearing. More HP requires engine mods (as you have done).
The US also has well developed fueling infrastructure, where fuel can be found everywhere. Petrol is potentially easier to find than diesel. US smog laws have saddled newer diesels with sensitive and unreliable emissions equipment which seriously compromises diesel drivetrains. There's some other reasons too including how diesels impact payload etc.
Because of these reasons, as one that tows, even if there were a diesel option, I'd choose the gasser for its superior HP. And add an aux tank for more range.
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