I have a 2016 Roadtrek SS Agile that I bought new. I've been very careful to not drive it on salted roads because of my concern for the resulting corrosion. As you can see in the picture, the battery holder has held up well.
That said, you can probably salvage your battery holder if you are handy with tools. The holder would have to be removed, cleaned up and painted, first with a rusty metal primer and then a good coat of acrylic or enamel. Removing the batteries and the holder from the rig is not difficult if you have if you have a jack that you can put under it. I purchased a 2-ton garage jack from Harbor Freight for the job.
I centered the jack under the battery holder and put sufficient lift on the holder to allow the holding pins to be removed. and then lowered the jack, holder, and batteries onto some scrap 2x4s on edge. With the battery holder resting on the 2x4s I could roll the jack away and have access to the wiring on the batteries for removal. With the wiring removed and the aid of the jack, I was able to slide the whole assembly out from under the vehicle.
I believe I may have driven the rear wheel of the rig onto some blocks before the removal in order to have sufficient clearance to pull the battery assembly free of the vehicle.
If the verticle components of the battery holder also need refurbishing, they can be removed using a socket wrench with extensions.
One thing I have learned in owning the Roadtrek: there is almost always something that needs attention, though I did just get back from a 6300 mile trip out West that went without a hitch. I just have to get all the bugs off the front.
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