High tiers are easiest due to the higher hp pool, but a T8 scout you are comfortable in would work as well, you are only after 1.5k per game.
I used the Rhm Pz.
Don't forget tracking shots, they can really pump up the damage if you get a city map. Go with the HTs and track enemy on reload, your agility makes it easy to retreat behind your HTs.
Platoon with Arty they sometimes work with you, and mash whatever key you have to mark targets.
High locations which give spots into a couple of areas are preferred, eg the top of the hill on Prok.
End game is an important source of spotting so stay alive. Running away early is much better than trying to get all the spotting damage in the first 3 minutes. End game spotting is often a lot easier to get once the vision opens up a little.