It's not yet posted on their website, but you can call Elecraft to place your order for the KAT500 high power auto tuner. The price is $699 for the factory assembled version and $649 for the kit.
If it works as good as the 100 watt version built into the K3, you should be able to load up just about anything.
If it works as good as the 100 watt version built into the K3, you should be able to load up just about anything.