Ah ok you got some pre-hacked TZ85s; those'll do you nicely

You won't get much grip out of those wheels as is; they have a hardness of 85 Shore A acording to the datasheet (https://www.bilcastors.co.uk/images/...12_114_115.pdf) which is pretty hard as things go (http://www.smooth-on.com/pdf/durometer_with_logo.pdf). You either want something around 30 Shore A, or just get those ones and screw bike tread to them using wood screws, which is what a lot of people do to add grip; my feather has wheels just made of plywood wrapped in bike tread which works fine! It would also add some extra diameter to the wheels which might be useful; make sure you have at least 10mm ground clearance around the wheels, or you will spend all your time stuck in potholes in the arena floor caused by the heavies!

Charger looks fine; I use a cheaper version of that and haven't had any problems with it.