My trailer has a 6 amp charger that is extrememly RFI unfriendly - like an s5 generator. I unplug the AC from the trailer when I operate HF.
I have an Astron switcher that's robust and lightweight, also my FT-897 has the bolt-on switching supply that seems to work very well for that particular radio.
Regardless, a 30 amp AC service is plenty for a 100 watt radio so no worries about any sort of overload unless you are already marginal on power - if you are, then consider using your house battery 12 volts for power - but you may want to switch off your charger if it's as noisy as mine is [either way actually].
The modern switching power supplies for radios seem to be pretty quiet in my experience so you don't have to haul a heavy linear supply unless you want to.
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