Link For ONE HUNDRED AMPERE DC/DC Solid State Relay

I have used SSR's (usually crydom) for many projects, usually when I need minimal switching power IE a battery device switching something with it own power supply. Or optical isolation of the switch, or insanely high switch speed / durability.
For general switching in rv's I tend to use relays.

For example

SSR's have a .5 to .75 volt drop across them, hence the need for a heatsink several times their size. At high loads, what you save on switching current, you loose on load voltage.