I am assuming laws have been added since, but decades ago certain trailer hitches were rated as not needing safety chains, especially for equipment trailers. I really doubt it is still the case - I would assume all states require safety chains now, and also assume most require them to be crossed.
I do know of one landscaping crew who had their hitch break (or disconnect, I forget), and the crossed safety chains did exactly what they were supposed to do -- they cradled the trailer tongue off the ground until the truck stopped. I think the hitch jack did drag on the road a bit, but the guys rehooked the trailer up and were on their way. This was not at highway speeds, local road.
I check the receiver on my truck at least twice a year (rotating tires), usually more often if I am tinkering around the truck. It is pretty heavy duty and rated for twice the weight of my TT.
Check and maintain your equipment, then go out and enjoy yourself!