This is important, back then we had veteran levels AA was an pretty hard dps check not only Valariel but also the final boss on execute phase there using negate at correct time was important.Normal trial - any build, any dps.
Vet trial - hard to tell. When vet trials came out, ~2 years ago, the maximum DPS the best DDs could achieve was ~25k (less CP, not frontloaded, less powerful sets, no weapon ultimates, lower stats in general, etc.). Hence, most people running them had between 15k and 20k. The trials didn't change. Back then, people just followed all mechanics. Nowadays, barely anyone knows all mechanics. People solve problems with higher DPS. Since people are now able to achieve twice the dps as it was intended for these trials, groups have higher requirements, as they choose not to care about mechanics and just outdps everything.
To answer your question, it's possible with 15k, but since power creep turned people elitist, they probably won't take you. Most groups will require at least 35k on a dummy. Very dedicated groups will require 40k+. 50k is what the best DDs achieve.