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EV hub motor torque for pulling a roller

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    EV hub motor torque for pulling a roller

    I am working on a 500 kg roller, which I want to pull using electric motor. I am considering hub motor, since it is easier to frame a basic ev with it. Now I need to know the capacity of the hub motor, I need to choose.

    Roller weight = 500 kg
    Frame weight + driver weight = 150 kg
    speed required = 10 km/hr
    Surface on which the roller is to run is predominantly flat.

    Being new to such design projects, I may have missed details. Please ask me for them. Help me with the calculation.

    Thanks to another contributor in another forum, he helped find the folling resistance;

    The closest coefficient of friction, I am able to find is;
    0.04 - 0.08 car tire on solid sand, gravel loose worn, soil medium hard

    I took this from;

    Fr = c * mass * acc. due to gravity
    Fr=0.08 * 650 * 9.81
    = 510.12 N

    But we are already talking in terms of weight, so are we already done with our m.g calculation, so is my 650 kg already W, so Fr = 0.08 * 650 ?
    If so, Fr = 52 N

    The surface I am going to roll the roller on is a play ground with grass grown on a field level hardened soil.