Yes, this is tactics who works well, main purpose is to get muscle memory for skills to use.@akl77 There are several overland world bosses that mimic trial boss scenarios and mechanics, albeit not with the same severity, but you can definitely test out your tank build with them...and you can use different ones for different mechanics. If you're interested, message me and I can tell you a few spots.
When I was testing my tank I went and played with the bosses in Wrothgar.
Sometimes just for fun I'll take my healer out and try to keep all the dragon hunters alive.
Half says yes so far, that says it all.
It'd be simple enough to set up,
for the tank - a "dummy" npc/statue/whatever that you activate and it brings up a list of avaiable mob spawn types i.e. "overland, dungeon, v.dungeon, trial, v.trial" after picking the type you'd then get to pick the number of said mobs that spawn in, sure they won't have any of the particular mechanics, but they will at least give you a solid enough feel for how your tank setup is working
for the healer - a friendly dummy that constantly sits at 50% hp via degenration [meaning while your heal applies it instantly takes damage to reset it to 50% hp] and after your all done you get a HPS number
while neither of these solutions are perfect they are still leagues above what we currently have available in that area... which is literally nothing.