My 335 was the same. The inverter is a Xantrex Prowatt 2000. In fact, if your reefer is the same as mine it is rated at over 900 watts and will draw almost 9 amps so FR used a 2000 watt inverter since a 1000 watt unit was too close to the edge. Let's not be too hard on FR since the National electrical Code requires that all major appliances (refrigerators, microwaves, etc) be on dedicated circuits and that is why the coach is wired the way it is as they had no choice. You can do what you want in the after market, but they are stuck with the codes.
You can't simply subpanel this unit since it has an external transfer switch and you will need an additional transfer switch for the additional outlets since right now you only have a single switched 115 volt line. What I did was add an additional Xantrex Prowatt 1000 and transfer switch to power the non-GFI outlet breaker in my electrical panel. There are two breakers for the outlets in my unit and probably yours. One is for the galley and bathroom GFI outlets and the other is for all of the remaining outlets, no matter where they are. It was relatively easy to do in my rig (rear power bay below panel and tapped the inverter to the converter output bus, only inches away.) In fact, after doing it I thought that FR might have wired it that way for an optional additional inverter. Now I have inverter power on all of the driver side outlets, both TVs and all the the outlets over the dash, all of which are on the breaker. Putting this on the existing inverter is possible by only adding an additional transfer switch (no subpanel necessary), but that is a lot of outlets on your 2000 which only has a continuous rating of 1800 watts. If you overdraw, the inverter will protect itself and try to come right back after the load is removed, but I wouldn't recommend it.
I added an Pro 1000, but you could add a Pro 2000, just like your reefer has. However I have never needed more power (generally use no more than 500) and the wiring from the converter to the batteries is #6 and over 20 feet to the battery bank, which is too small for the 2000 to have elbow room. A 2000 would require a new feed, but that would allow my 70 amp PD converter to get 70 amps to the batteries anyway and I may upgrade that circuit in the future both for the inverter and the converter as well.
Sure, my salesman told me I had inverter power to outlets, but of course he was mistaken (lots of RVs on the lot and each is different.) I will say that with the additional inverter it is great to always have power on a bunch of outlets without flipping switches and moving plugs and extension cords. Best update we did so far.
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2015 335DS
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