Yep, Praetorians can do itrials, etc... as long as they launch from zones they can access.
I suspect zones like Ouro may have issues with how funky the alignment system works, but if Praetorians can use Pocket D, then maybe?
And yea, I do play Gold, but like Lunar, I play solo there. I had a couple level 50 Praetorians, but now I just swap over at 20 and still do the First Ward, etc...