Of course there is. The SGC SG235 will handle 500 PEP, and 200 carrier once it is tuned. It is weatherproof.
The LDG 1000 will do even better, but it isn't weatherproof, nor is the one from MFJ.
The fact remains, there are better ways to remotely tune a vertical, and with a little ingenuity, you can built one a lot cheaper than buying a high-power auto coupler.