I am in the process of making the guide on how to equip and the tactics involved
Here are the tanks I used to try and get the cheevo. I found every single one on that list was able to net me 2x ram kills on normal maps, not Steppes/Highway.
The tank which got lucky and popped the cheevo for me on Highway was the PZ III/IV
I tested out Mediums, Lights and Heavies and found that each class has its own tactic to ram kill.
X E50M MT GER
VII Auf Panther LT GER
VI KV1S HT RUS
VI M4A3E8 MT USA
VI M4A3E2 MT USA
VI MT25 LT RUS
V M4 MT USA
V T1 Heavy HT USA
V KV1 HT RUS
V PZ III/IV MT GER
V T14 HT USA
V Chaffee LT USA
IV M5 Stuart LT USA
Lights and Mediums who are heavyweights but quick and not real good scouts but good flankers are good to chase other Lights/Mediums and Arty.
Heavies make good rammers if you follow your team and steal kills by ramming them.
I would suggest having an assortment of tanks which have natural ramming capabilities. Equipment should be Spall Liner, Enhanced Levers( so you don't track yourself while ramming) and Vents.
Your crew skills should Controlled Impact, Brothers in Arms , Off road driving, Clutch braking, Smooth Ride. Note that you will not be shooting(only shoot at targets to track them or to withen their HP down so you can finish off with a ram) or having to look for targets so you won't need optics/binocs, Follow your team around and basicaally steal the ram kills.