KPj, so no matter the deadlift variation you should always feel it in the hams?
Yes. I think so.
Could depend what you mean by 'feel', though. Your never going to feel your hams in a conventional DL in the same way you feel your Biceps in a concentration curl. If that makes sense. But after DL's, your hams should be pretty much done.
I've only used Trap Bar DL a handful of times, though, but agree with what Peter said. It's true that it's a little more quad dominant than other DL variations, but it's still primarily a DL, which hits the whole posterior chain which obviously includes hams.
Trap bar DL is a good beginners DL. I've read the likes of Cressey etc saying they use it for athletes because it's easy to teach and because your using a neutral grip.
If your looking for more hamstring work then I would personally recommend the Glute Ham Raise. Either that or the stiff leg variations that have been mentioned. Single leg stiff leg DL's 'feel' more brutal on your hams, if that helps.