Help 4s or 2s in series?

[BrianG]

^ +1. Weight distribution is one thing, where that weight is distributed is another. If the greater weight is mounted more towards the center line of the vehicle, the net effect will be very closely balanced. Kinda like how a 200lb person can balance on a see-saw with a 150lb person simply by where they sit...

Also, the gyro effect of larger MT/truggy tires helps keep the vehicle straight.

So, unless your weight is quite unbalanced, I wouldn't worry about it.