I fought my very heavy KT and JT more than once at D'ville with no problems, it's all in the gearing (stock Tamiya) and the least rolling resistance possible, IOW bearings where ever possible.

As for the OP, no one suggested a Tamiya. Perhaps a Tammy Sherman would be a good start. Quite reasonable, comes complete with all electronics except radio and battery, excellent transmissions, excellent running characteristics and an easy, entry level build. Everything fits first time and both my Shermans are now over 15 years old and had the mortal you-know-what run out of them. One is also a long time veteran of D'ville back when the field was a rock garden. Both run as new and both have the original Tamiya transmissions and electronics in them, never a problem with either of them and that includes the real rock garden I live in now.