I like #5 the most with the words moving or in motion. I'd like to either see a little more grey, maybe orange as well.
The truck is a good idea if it could encompass bulk. Most users of our business will be hauling bulk grain, feed, rock, fertilizer, sand, dirt, liquid, etc...
Frankly, I don't fancy much my first entries. The are a bit too talkative and busy.. Besides, I couldn't develop way of depicting so varied loads other than symbolic. Here is something that's simple, heavy, dynamic and can be recognizable.
I red your request about border around logo in general comments couple days ago but it would be close to using other designers concept which is prohibited on this website. Of course it isn't that unique concept and you could add it yourself without any breach of intellectual property laws but designers here are very touchy so I just didn't want to take a risk of another storm. Besides, to provide revisions after closing of the contest designer must be ranked first.