My advice is to stick with the trainer you know. He’s done a good job once and he’ll probably do it again. You may well even use the same vehicle, just with the trailer added. You have the perfect opportunity to move on to artic with your mate. Yes, there is stuff to learn but it’s not rocket science. We do a comprehensive conversion course in 3 hours, so a shift with him should get it sorted with a bit of luck.
Save yourself some money and stay where you’re comfortable. (Unless, of course, you fancy a residential course with me on a “grown up” artic!)
Pete 