People always think, "Oh I'll only be taking along 300lbs of stuff," when the truth is ALWAYS closer to 1000lbs over the advertised dry weight of the trailer, counting options, battery, propane, etc., and traveling alone.
Even so you will be well within the comfortable range for towing with that truck.
Weight distributing hitch is mandatory. I think the limit for needing a WD hitch is only 500lbs on that receiver if it's the same as the one on my 2015. You're at 490lbs now. 40lbs of propane will put you over. Besides if you get one with integrated sway control your overall experience will be much happier.
IMHO, airbags are optional. If you were closer to payload capacity, I might have a different opinion.
Don't forget that payload is for everything in the bed AND in the cab. If you have your three 250lb linebacker sons coming along for the trip, you will be over your truck's payload capacity.