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They each have their merits. Buying a pair of cheap batteries is convenient because you won't need to disconnect your truck battery if you need to weld and those will be your welder's power source back at home. On the other hand cheap batteries don't last as long and that good price adds up when you have to buy cheap batteries a couple of times.
Buying a nice battery to complete your two battery set up in your truck is a direction you probably want to go anyways and most of the time that battery will be used for other accessory demands in the truck. However you will need to disconnect these batteries from your electrical system to use them as a 24V supply for your welder. I had thought of some elaborate way of connecting and disconnecting from the electrical system and ultimately decided it was just easier to disconnect my batteries if I ever need them for my welder (which thankfully has been rare on the trail).
Ultimately I like having both, a dual set of batteries in my truck that I can use with the weld if needed and a set of batteries at home that I use as my normal power supply for the welder.
The question for either set up is how are you going to charge these batteries?
I'm wrestling with the pros and cons for both.
If I had two batteries in my truck, I'd wire them in parallel and they'd be charged by the vehicle's charging system. I would disconnect the wiring from both batteries and use my RW2 wiring to connect them together for welding. This obviously runs the risk of draining both then I'd need to jump the truck. I don't think I'm going to be welding every week, so this would be an infrequent inconvenience and my welding is going to be at my house, where I can always jump the truck.
If I had two batteries in my garage, I'd wire them in parallel and charge with a trickle charger.
I'm leaning towards the two platinums mounted in the truck.