MTM2.com

I use a few different methods to help me build trucks and wondered if anyone knew of any others or used these same ones as me.

Firstly I find having a toy model of what you are building very useful especially fo getting the correct scale. I also often scan the toy models to get textures.

I also write down all the co-ordinates of all the vertices and all the vertices of all the faces.(Very boring I know but if something goes wrong it's great)

There are many ways to work but sounds like you have the idea pretty much in hand. I once created a truck from photographs of a real truck. And Drive2Survive has written what is probably the most extensive description of truck making anywhere.

http://cownap.com/~d2s/

If you have the time and patience to note vert and face coordinates then I think you'll enjoy Drive2Survive's work. He goes into incredible detail that can't but help anybody wanting to make trucks.