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The reason the LFP batteries are used in RVs is their cell output is 3.2 volts where as the typical lithium cobalt ion battery has and output of 3.8 volts. When compared to a lead acid battery's cell output of 2.12 volts, (to get to 12.8 volts which is what a typical RV uses), you need 6 x 2.12 volts cell (12.72 volts) or 4 LFP cells at 3.2 volts each (12.8 volts). You can not get to 12.8 volts using multiples of 3.8 volts per cell.
What makes the typical RV LFP batteries safe is they have a very smart (and expensive) battery management system (BMS). Its job is to monitor each cell individually and take it out of the battery cell train if the BMS detects any problems with its temperature or current profile. LFP batteries of less than 15 amp-h seldom have a sophisticated BMS.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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