SACRIFICIAL ANODE, other than the hot water heater ?

I am very familiar with electrolysys having been a saltwater boater since 1982 with boats kept inwater. Zincs/anodes on landbound vehicles? New one for me.

I suppose if you wanted to provide a good bond between aluminium house frame & vehicle frame that could be done with a dedicated bonding strap easily accessible for cleaning. I do check the waterheater anode annually.

If you are going to put an anode on the frame be sure there is no paint under the anode for a proper bond.