Ford V10 Power, effectivity

I guess it depends on how fast you want to get up the hills. Both will get you to the top, but obviously one will get you there faster. The V10 is powerful enough to handle the chassis rating and whatever you can tow, depending on the rating of the hitch. Of course, the more you load it, the harder it is to pull it....and yes, typically a diesel engine produces more torque at lower rpm than a gasoline engine. The V10 has a smaller piston and utilizes a shorter stroke ratio, so in order for it to make its power it gears down and runs faster rpms. But it has been proven to be a VERY reliable engine over the years.