The slide drive is a 12 volt powered system ; so breakers and GFCIs don't factor in to the non operation.
You need to check any and all fuses.
The other factor is battery capacity , were there any warnings in your owners manual , saying ; to run the gen set , or be hooked to shore power when operating the slides ?
Being the third slide you activated , batteries may have been low. Particularly if you also leveled first.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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