There needs to be an "at the wheel" disc brake kit for these large vehicles. Like what FG Models uses on their 1/5 scale beauties... a brake servo that depresses an oil cylinder with 4 oil brake lines going to smaller discs at each wheel. This would take all the stress away from the drivetrain, and would also give a much better braking feel.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens
In general the wireing should be as short as possible, the solder job as good as possible & the connectors should be of good quality... that much I know.
But... if I should choose between long wires from battery to ESC or from ESC to motor - which would be best? Id guess option 2 is better since the voltage drop is then on the "non battry side" of the ESC?