Yup, . . .fuse (or install a breaker) on everything (where practical) as you never know where those little electrical gremlins are going to appear - or when. All it takes is a mis-placed staple or screw to cause a short, or worse, a fire.
Battery isolators are ok however a relay has some advantages.
An isolator is basically a diode which will not allow your engine alternator to fully charge the motorhome batteries. Most diodes are maybe 88 to 92% efficient.
A relay can be wired to the ignition circuit so it closes any time the engine is running, therefore providing a full (nominal) 13.8 volts to your motorhome batt's.
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