Can't offer much advice but just got myself a Carry Freedom Y-Frame because I like the adaptability. I will be using it for many different tasks including runs to the tip/recycling bins, fishing, camping and hopefully some light tours and it should be able to handle them all.
It only came yesterday and I've only had a test run empty but I could hardly tell it was there (apart from the rattle), so as I say I am still a novice yet. :oops:
The ExtraWheel is worth a look - there's a good review here