If it were me, I would try and find you a truck for about $12000 that had never seen a R.O.W. Then I would try and find me an SA200 for around $3000, with the $2000 left you could buy any tools that you may need, grinders, jack stands, etc. Although you wouldnt have a ready made welding bed you would still have a truck that you could work from. When the time is right you can build your own bed how you want it, cause a lot of them old beds are not like the slick ones you see today. They may do the job, but a lot of pipeline welders are judged by thier rig. And after working for a year or so and the bank balance is on the up, you might wanna look at getting a newer truck. Just my opinion, for what its worth!!!