Hey couple of things Ive learned: just remember to cancel your trial before the trial period runs out so you wont be charged. After that just complete as many trials as you want, wait 2 days and they will show up as pending, wait 2 more and youre done they will be completed.
I suggest using the aol, efax, and all the REAL trials, as they are all quick, fast, and add up to a lot of points.