toyota may be coming out with a deisel for it's tundra in a year or two.
I would think this would be a great compromise with an aluminum 20 foot enclosed.

May not be able to do 75 towing down the highway...but the rest of your daily driving would be a lot easier and more practical then driving an 8000lb 3/4 ton.

I know the big trucks tow better...but if your towing once a month or less...You may consider the importance of the vast majority of your driving.