I am installing radio equipment on an aluminium boat (Ovni 435)
In order to avoid electrolysis, what is the best way to ground vhf and ssb
transceivers on a aluminium boat?

I have to use a "floating power supply", so neither the positive nor
negative power lead is connected to the hull.
All installation manuals tell me I should ground my equipment (transceiver
and antenna-tuner) with copper-foil to the hull. I think this would trigger
2 very bad disadvantages:
1. I would ruin my floating power because then I would also connect the hull
to the negative power lead.
2. Copper on aluminium will cause heavy electrolysis

Anybody out there who knows of a practicable solution?