Hey look, Noob needs help

[the_wakeful]

Hey guys, I'm playing the demo of this game and loving it except that its hard as crap. I'm playing on easy and I still can't get passed the 'attack the convoy' portion of the mission. I have read the tutorials on a different forum (linked from here somewhere) and read through other posts, yet I still suck at this game. Can anyone give me some ideas that I might have missed so far? I can make it to the hill with no casualties (if I'm careful) but I just get destroyed from there.
Thanks for the help.

P.S. the tutorial says something about capturing enemy armor, but I can't figure out how to do that (besides grabbing a truck I found). There are lots of anti-tank guns around that I want to use.