Nice choice, congratulations!
I was wondering about the ext. warranty when I picked up my 35QBA last year. I decided since I'm covered for the first year anyway and since I would know how well it stood up during that first year to forgo the ext warranty. I'm glad I didn't pay any money for it as I've had no problems that required my taking in for fixing. That's not saying I didn't have a few tweaks and repairs, just nothing that required my taking it in on the coach side (one Ford recall only).
Watch your weights on towing that truck with the motorcycle. Even with your higher capacity, by the time you load clothes, food, water, propane, pots, pans, tools, chairs, and other stuff... you might be near or over the max with your choice of the tow vehicle the and passenger (bike).
2011 Allegro 35QBA
Kar Kaddy KK460SS
2007.5 GMC, LMM D/A, Crew Cab, Z71 4x4, Long Box