I (nearly exclusively nowadays) specify and use Thomas 12x12 Supertruss, which lists in SAE dimensions but always seems to arrive in odd-ball Metric lengths to equate SAE lengths...
Be certain to specify inspection requirements for your rentals.
There are plenty of less-than-scrupulous
truss renters that will
send out any old thing regardless of its mileage/use/abuse/dentage/weld conditions/frozen and swollen ends/age/stretch/overloaded and sprung/use as a traction device to get the truck out of the ditch/crap.
Yes they
should get inspected prior to use, but what if, the day of install, a lot of it is poopy/unsat/bad and there are not enough good spares available??
In backwater Belgium.
Never
specifically happened to me, but there's a reason my rate-card is a regional affair...