You're already way past the sticker weight capacity, and realistically, loading a bunch of weight high up on the bike doesn't do anything good for its handling.
I'm sure there is a a negative effect on handling (on the long rides I'm riding conservatively to maximize range anyway), but the specs for the top box and side cases from the Givi website says each case can hold 10-11 lbs. Each charger weighs just under 11 lbs., so I'm probably overweight just a bit (with the addition of the extension cords, Y-adapters, etc.), but not by much.
So what is the total cost of this charging setup, if you don't mind me asking?
$2200 (two chargers and two Y-adapters from Zero and a J1772 adapter from Hollywood Electrics).
It would have been another $600, but Zero gave me a charger for free since I was one of the owners that bought the bike just before the price drop (they also gave us a free riding jacket and pair of gloves).
It's pricey, but I chose to go that route so I can take longer rides and charge quickly without voiding the warranty