I am going to be purchasing an 7.3L f350 for work. I work with animals and am going to be putting a cap on to keep the animals in. Does anyone have any ideas or suggestions on how I can get heat into the bed/cap area? I need to keep the animals warm in cold weather.

Right now I have a 7.3L E350 but I can't stand driving a van and since I travel throughout the Northeast and Midwest, 4 wheel drive will be a great benefit. right now the only benefit to having a van is that I can keep them warm.

Thanks,
Ryan