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FYI
https://www.wago.com/us/laboratory-tests

I am a welder not an electrician. I don't trust any wire nut I have ever used. I'll do a pull test and half the time they fail. 
I switched to WAGO about 10 years ago. Using them on trailers (RV and equipment) for both DC and AC loads. None ever failed my pull test. None to my knowledge have vibrated open. 
I trust them the most when connecting solid wire and stranded wire. 




I say use what you feel you can install correctly. 


WAGO are not UL listed they do have many European certifications.   

All just my opinion and experience.

FYI true WAGO brand lever locks are UL listed. That is the one warning with buying them is to buy them from reputable source, lots of knock offs out there, don't think I would buy them off amazon unless it was from a reliable seller that I knew. I am also not sure that they are UL listed for use in mobile applications, but WAGO says they are suitable for mobile applications. They recommend not using them on high use high amperage connections. I would use the insulated terminal blocks that Richard likes, name of them escapes me, we call them Polaris lugs. I used the polaris lugs on my A/C units.

Oh and wire nuts are not approved at all for mobile applications. Typically they use crimp on connectors for the AC wiring in RV's for making wire connections.