My Ten Tec 238B L-Network tuner works well at 1500W. Some tuner networks, especially T-networks, can have very high currents through the shunt inductor.
The largest issue with T tuners is capacitor value. Most tuners use generic 230-270 pF maximum capacitance caps, and that makes the network Q way too high on 160 into low Z loads.
The ATR30 has around 500 pF, and that makes quite a difference. It will handle well over 1500 watts on 160 without issues, and several kW on 80 into reasonable impedances. It has a lot of headroom for weird load impedances at 1500W.
All that aside, I don't know why people would want to use a tuner to match a real low impedance anyway. Other than some tweaking to extend useable frequency range, the matching is really best handled at the antenna with the tuner just extending BW a bit.
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