I just looked at the owners manuals for both the 2000 Dodges and Chevies.
The only gfci reference is in both and says if the frig quits working to check the gfci in the driver side lounge box.
To me that would indicate only the frig was on gfci, probably because it can be accessed from outside the van.
This would further back up the idea that it as been poorly rewired to put all outlets on the single gfci.
IMO, the best to do would be to wire it back stock and if you want gfci on the other replace the oulets wiyh gfci ones.
The only gfci reference is in both and says if the frig quits working to check the gfci in the driver side lounge box.
To me that would indicate only the frig was on gfci, probably because it can be accessed from outside the van.
This would further back up the idea that it as been poorly rewired to put all outlets on the single gfci.
IMO, the best to do would be to wire it back stock and if you want gfci on the other replace the oulets wiyh gfci ones.