You may want to check all grounding on both the generator and the inverter. If you have an open ground on one or the other it may be causing the problem. Or possibly no common ground between them if they are in different parts of the TT. I think I would try to run a common ground wire between the two and see if that may help.
I say that since you said you didn't have any problem with your previous trailer.
RV dealers? I would be surprised if they had any terrific electronic knowledge.
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2012 Jay Flight 19RD TT
W/thermal package: R19 walls, R22 roof, R24 floor
2008 F-250 Ford FX4 6.8L V10/4.10 rear axle
Curt class V hitch
Reese trunion WD with dual cam
AC6CV/7 ex-W8RUR since 1954
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