If you ordered the G614 as an option, yes!
Mine came with 5 G614 tires. I don't actually recall if the wheel is steel or alloy on the spare.
If they were a Dealer install and you didn't specify the spare, then the Dealer may be able to argue back.
As far as driving on different size tires, its not really an issue on a trailer, but an ST tire (if that is your spare) limits your speed to 65 mph.
Brad & Dory - Lone Tree, CO
CURRENT - 2013 Itasca Meridian 42E/2013 Wrangler 4dr Sahara
SOLD - 2014 Redwood 36RL/2014 F350 DRW