Onan Microlite 2.8 genset runs but no AC output

Does the coach have an Automatic Transfer Switch? If it does, it could have failed. If it does NOT, then the genset powers a receptacle, probably where your shore tie cable is stored. You have to plug the shore tie into that receptacle to power your coach with the genset.

I did shut off each breaker in the main box inside and flip them back on. I also looked at the small fuses. As for the junction box, I am not sure where that is located? All of the wiring seems to be firmly in place.

There will also be a breaker in the main distribution panel, check it also.

Welcome to the forum.
Did you turn the breakers off and back on? If not, try that.
Don't just look at them, sometimes they need reset.
Always try the simple, easy things first.

Might open the junction box near the generator and check voltage with a meter.