I don't know exactly what to do with all of these number so mayby you can help me some. I am looking at getting a chevy silverado truck and was hoping that you could inform me on what vehicle and engine strength I should get. If I will be pulling a horse trailer with a GTW of 12,500 lbs and a tongue load at bail of 1,875 lbs what truck vehicle would you recommend. Naturally that number doesn't include 4 people seated in the front seat at 175 lb per person and some more cargo in the long box that could reach 500lbs while I am pulling that trailer. I would also like a gasoline powered truck with an extended cab, long box, and automatic transmission. Which size vehicle would you recommend with the size of engine in it also? I also carry loads of sand/gravel and that can reach as much as 4500 lbs but there is usually only one person in the cab when I am carrying that load. I think that is all I can think of. Thanks