I agree with pull test, years ago on my over the road truck, I hitched to the trailer, looked to see that the pin was locked in an jaws shut, did an pull test and low an behold almost dropped the trailer, they weren't locked Ugh ...
A month our so later the same thing happened on our 5th wheel, check, yep they are locked, pull test, nope not locked, found I had to get 5th wheel fixed, was lucky I was not going down the road when the 5th wheel latch failed :(
I have well over a million miles over the road driving, from day one I have always done a pull test no matter if it was an old truck or a new truck I never trusted the 5th wheel to be locked. You can do what you want but a quick Pull test never hurt anyone and it all about safety for you and others :)
The other thing I do is put a lock on my pull handle so it can not be pulled, there are people out there that will walk by a trailer no matter what type and pull the pin lock handle, trust me I have seen such in truck stops. If i stop anywhere an am away from unit for more than a few minutes and out of site from such I always do a walk around, check my tires, check to make sure my king pin is latched, again it's all about safety :)
Safe Travels