They don’t run on 30 amp they run on 120V AC.
On 12v lighting
, sure it’s very possible. But you will need to add a power center with a converter, or a converter minimum, along with 11V wiring and 12v fixtures. Even my unit that had a power center and 12v wiring I replaced most of it. With a trailer where the actual body is only ten feet long, it’s not that big of a job. A new power center keeps everything organized and is worth it imho.
+10 Spec sheet inside closet door will tell you what the trailer originally fad. Mine had a PD6911 power center, pretty common back then. Mine never had a battery. Line #7 is gas container. Next line is blank, but mine has typed in Power Converter Pro. Dynamics 6911. It’s just above the middle of the data sheet.
I mainly dry camp so having functioning 12v and later, functioning propane
are both very important!