I imported twice, just because I thought it would be "neat" to do it. The first time I got guys I knew to go in with me to get a 20' container. I got two tractors on that load, and I still have them. The second time I did some soliciting on the internet and got enough to go a second time along with 4 for myself. I made a deal with a mechanic friend of mine to do any required repairs and sell them. We split the profits.
We did well, but man is it a headache! I can't tell you the number of hours I spent on the telephone and e-mailing. If I didn't have a full time job, and a family to care for, I might do it again. But things have changed in the year and a half since I last did it. I imported only Yanmars, but it has since become more difficult to get good tractors in small volumes, and it has become more difficult to get parts.
Look at it as an adventure/hobby first. Then you won't be disappointed with the amount of time it takes just to arrange things.