Jumbo cart. Checking.
Repent and Panky here is the one I was talking about:
New Jumbo 510 3.5ml Cartomizers
I have tried the Dual coils of the Darwin but for some reason I prefer single coil cartos on the Darwin. Others like them and you may too. I would suggest getting a few different ones so you can find the one that hits the spot for you. Since Drew ships so fast it is not a big deal to reorder. Keep in mind that the Jumbo cart will not allow you to fold the arm down but since I use my Darwin all day it really is not a issue for me. Also note that on standard sized cartos I always add a 510 drip tip since it makes topping off easier. Check out the colored and twisted ones on nHaler site. They are a little pricier than the standard DT but in my book they are worth it.

That is of course, if the mail service is on point. I'll probably buy one of the big tanks to mess around with but I don't know if I would take it out with me or not. It would make people look at me even more 
