Remote home assistant, 2 pi's

i run ha supervised in raspbian. i like supervisor and having add-ons built in and hacs. i never got the hang of using docker on it’s own.

so my pi4 is a workhorse and I’m thinking of offloading some of the workload to my pi3. i am looking at the addon remote home assistant and am i correct in thinking I could run hassio on another pi and the slave could run some of the add-ons while the master runs some as well yet it will appear like one system? I’d actually run adguard on both, use one for node-red the other for mosquito broker, etc etc? am i wrong here?

Yes but ultimately a pc will be best.

You could look at hass os with debian

I’ve ran ha on a pc with vm for a couple years, I’ve settled on using pi.