I'm leaning towards needing durability because if the unit goes out I'm loosing thousands and thousands of dollars in meat and produce.
nothing wrong with going tier-one! it does cost more, but only once.
I bought the first 6048 as a bit of an experiment, and to be honest, the original motivation was to run 'a really big emergency lighting system' ie all my shop lights, since (frequent) power outages are no fun standing in the dark and pulling out the Honda... so I didn't start out with big loads in mind, or a long term Solar Power Plant.
But once I had the first 6048 and it just worked and we had a winter storm but the shop system kept the house running, yeah green light to expand - it seemed just too easy to pair another one to it, to increase capacity. Well if you can get more capacity with two, why not three? - I just stuck with the same make and model so they could all be inter-connected and work together for the big motor loads. It just all worked and I didn't see any benefit to changing. But now I am at max for this model - three is it.
To go to 24kW output, I would need two 12kW stackable inverters...yeah I am keeping an eye out on what new equipment is released over the next while, I would like to see a pair of 12-14kW inverters with lower idle than my MPP's but I am good for now and not in a hurry. I will add PV and battery for now.
Thousands of $$ of stuff in a freezer seems like a lot of risk, but frozen stuff doesn't thaw very fast, you can monitor the system and know if it fails. If you are 100% off grid, then the risks are far higher, if grid is available - you can set up an ATS and not need to worry about it. My fridges and freezers are all on a Reliance CLP and can be switched back (manually) to the grid if we ever need to.
If the budget is there, tier-one stuff all looks nice, and from what everyone says, just works.