All trucks, most big. If you don't have a big truck, or a tank, don't waste your time submitting.
Phoenix77, I absolutely love your trailer & hmmwv. If I had the money, I'd like to send you my M105A2 trailer so you could work your magic on it. Now, my experience with MV of the month is like this. For 2 1/2 years, I entered my M35A2C, & M38A1 in the MV of the month many times, and I think the most votes my M35 ever got was 14 votes, and I think the most votes my work in progress M38A1 got was 5. This last March, I finally won an MV of the month contest with the M35A2C. But a lot has to do with patience, and how you campaign. It's not the size of the vehicle. Tell the voters everything about your vehicle, (history, work you've done, and so on) give them lots of pictures, static and action. So my best advice, is to have patience, campaign like there's no tomorrow, never give up, and have fun.