Here is a post I put up on the panel I put on our TBOK (sister model to your QBOK) last year.
GoPower Flex Solar Panel Install and Battery Upgrade
The only real challenge was fishing the cable under the floor at the door in the frame and bringing up into the basement to connect to the controller. I would highly recommend a fish tape to do this.
After a year I'm really happy with this install as we are able to keep our fridge running all summer (on propane) while in the storage lot and it keeps up with the parasitic draw plus keeps the batteries topped up. Having the second battery is also nice on the cooler late summer or early fall evenings when the furnace needs to run if we are dry camping. During the winter, the batteries remain fully charged with the disconnect turned off which allowed me to not have to pull the batteries out.
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