In automotive applications (I'd consider the RV automotive) I have become a fan of soldering, then shrinkwrap and a finish of liquid insulation. Used that method on all my RV connections when I rebuilt the electrical.
I did notice that when I tore apart my RV, the interior wiring was done with crimped on wire nut looking "things". Given that is how the factory did it, I might be comfortable with just crimped on butt connectors and heat shrink when I install the new LED's for the cabover lighting.
I do keep wire nuts on hand for emergency repair, though.
Jose
