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I don't think adding weight will void your warranty, especially if you can remove it if a problem arises & you have to snd it back.  For the motor's sake, I would check the stall current of the loco & then check the amp draw with the added weight.  To check the stall current you need an amp meter connected between the rail pickups and the motor, then  apply enough downward pressure to  make the drivers & motor stall, then take the reading on the amp meter.  After adding the weight open the throttle up to about maximum speed and see what the amp draw is.  It should be less than the stall current.  It is highly recommended to check the stall current on a loco when installing a DCC decoder to make sure the decoder can handle the load the loco's electric motor needs & not overwork or overheat the decoder.  Some of my older Athearn diesels pull over 2 amps when stalled, compared to 1 amp on a LL P2K or Kato.  Tweet.
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