Don't have shore power set-up in the van but did on my boat. There was always a switch to select power source - shore or house battery. Does SMB have same or chargers are auto sensing?
Trouble shooting - Gooseberry And tonyvouy are on track - check 110V plugs in van to deternine if power is present in those. No power there points to residence outlet has no power, or extension cord is not transmitting, or a switch is not set correctly or breaker in van could be tripped. Start at source of power first, in his case, the residential plug and step by step, establish to which system point power is present. Then let us know so we can help from there. Would also be good to know if a voltage meter is available to you.
Apologies up front if this is too basic, just usually find starting at very beginning is the right way to diagnose a problem. I lost much hair learning this