Don't get me wrong, if it wasn't for high gas prices I'd love to have a tow vehicle with a 454 or 440 or 396 cubic inch engine.
Even a 350 or 289 would be a powerful smooth running machine.
But I've had plenty of days where gasoline was my greatest expense, well over $100.
So I've become happy with a more economical tow vehicle.
Not the 'Minimum' but, for me, the 'Right Size'.
Yes I do have to avoid or plan really far ahead for passing.
I do use all of the mountain truck/slow lanes.
I don't feel disadvantaged at all when I find myself passing a much larger 5th wheel with a huge truck with a diesel engine pulling it.