I'm guessing that same basic science applying to guitar amps and decibels applies also to inverter generators and decibels, so I'm looking for help from my TDPRI brethren. My wife and I have owned an RV travel trailer since June. Thus far we've camped in state parks both in Texas and other states in the Union (Louisiana, Mississippi, Tennessee & Arkansas) that have water and electrical power outlets. We're wanting to add a generator to our rig for boondocking/drydocking purposes. One 2000 watt inverter generator unit we are looking at is purported to be quieter (53dBs from approximately 25 feet away), and is relatively lightweight (48.5 lbs.). Problem is, one such unit is not sufficient for running our trailer's AC. Two such units connected in parallel can provide 30 amps of power sufficient for the task. But double the generators, double the noise? That's the question. From discussions I've read regarding amp wattage output and decibel levels, I believe that double the wattage is not equal to double the volume as measured in dBs. So I'm wondering if the difference between running two of these units simultaneously will be in real world numbers like 3dBs or so louder than one unit by itself. IOW, the level of noise increase will be barely perceptible. Am I right? Or at least in the ballpark of "right"?