My favorite car is a heavy-duty truck...
This is my 2004 Ford F-350. It started life as a Lariat model, 4x4 crew-cab, long bed truck with a standard box. The power train is a six-litre PowerStroke diesel, 6-speed automatic with overdrive, on-the-fly four wheel drive transfer case, and pretty much every option except for a moon-roof.
Over time, I added a few things; in addition to the 38-gallon main fuel tank, it carries a 44-gallon saddle tank, and a 91-gallon in-bed combination fuel tank/tool box. The fuel transfer system is a Standyne/Transfer flow system that does automatic balancing. I added a CM Truck Beds flat-bed conversion, replacing the standard box with a system that integrates four under-rail storage boxes, a head-ache rack, integrated gooseneck hitch, and additional tie points between the bed and frame.
The front mounts a Ranch Hand Sport bumper, with an integrated Warn 15K winch.
In addition to the integrated components, the truck has dual heavy-duty alternators, a 500W inverter, a 100-gallon freshwater (potable) system, a moveable 10K winch that can be mounted on either end of the truck, or remote-mounted, a pair of HiLift Xtreme jacks, 400 feet of grade-80 chain in four segments, complete recovery gear, and enough back-country survival gear for two people for twenty days, including radios and a pair of Sat-phones, dual GPS (one nav, one tracking).
The suspension system is heavy-duty, using leaf-springs on a two-inch lift, six-ply tires, and dual spares mounted under the flat-bed.
The truck is set up for pulling heavy-duty trailers - it is not by definition high-clearance, and because of the long wheel-base it is not ideally suited for some back-country trekking - at 27-feet long it is over-length for switchback travel in some cases. However, it is my daily driver on the ranch, and I put about 10K miles every year on it in backcountry travel in the Western U.S. and Texas.
It puts a smile on my face every time I drive it. Most recently, we covered 4325 miles, about 1300 of that off-road in Moab, Utah, various parts of New Mexico, and down in south Texas along the Mexico-Rio Grande/Texas border in the Big Bend/Big Bend Ranch areas.
A thing of beauty: