The other outlets not working could be another GFI somewhere else in that is tripped. Another thing to check is often times a breaker will trip but not really look tripped. I would unplug the shore power. Then flip each breaker off and press firmly in the off direction before turning it back on. A tripped breaker will feel spongy or springy in the off direction where the others will not.
As far as the 12 volt items (lights refrigerator, slide) my guess is the no power has caused the battery to drain. Either that or you possibly hooked the battery up backwards and it blew the reverse polarity fuses. Look for one or two fuses that are set apart from the other fuses a bit. Pull them out and swap them with two different fuses to temporarily test.
If you have a digital meter it would be helpful too.
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2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup