Home toilets are often on less than flat floors, so are shimmed level which creates and uneven gap so caulking makes it look better. Also keeps it from filling up with dirt. The proper way, IMO, to caulk a home toilet is to caulk only the front and sides, leaving the back open so if there is a seal failure you will smell it or see water right away.
An RV toilet would normally bolt tight to the floor, as nothing in an RV is level anyway
, so caulking really isn't something I would do unless it was in an area that water from the shower or some other area could get under it and rot out or rust something.