They are stainless. What gauge? I don't know. I use 16ga. sinks at home. My dad had me install an 18ga. for him years ago and it felt awfully flimsy but worked well for him. The ones in the RVs aren't any heavier than that I don't think....maybe even 20ga. although his 18ga. felt like you could push a butter knife in it and make a dent.
I like SS in a sink, DW is sort of middle of the road. We've never had one rust or cause issues unlike enameled cast iron (stains etc.). The bottom strainers can start rusting but they're a snap to pull out and replace. SS appliances is another story so I won't go into that but if you're in the market look into fingerprint resistant black stainless steel.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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