Alternatively a quick glance in a minibus window as you pass each other could be all you need to check your trailer.
I'm far from a pro but for a few years my job was towing these mobile bars you see at shows around the country. And last year had to tow a trailer from hereford to Plymouth, Plymouth to colchester and the beck to Hereford. All in one day.
With a good pre check of lights, tyre pressures and load straps and long journey precheck also including tow hitch bolts, secondary brake cable and wheel nuts and tyres. I've always been happy using a reflection on the windows of passing vehicles to check my trailer is attached and looks healthy.
If it's your trailer and you now the history of it half your problems have gone.
For me I always did a full check of the trailer I was about to tow as you never knew how much abuse the last idiot gave it.