The Battery Management System (BMS) within the LiFePO4 (LFP) battery should be designed to prevent charging below freezing. Some batteries have a built-in heater that uses the available charging current to warm the battery before switching that current to charge the battery. LPF batteries don't off-gas so you can install them inside. One 100Ahr LPF battery (smaller than a group 27 and weighing less than 30lbs) is roughly equivalent to two golf-cart LA batteries and will outlast them by many years.

You can discharge the battery down to -20C. Some say they operate up to +60C, but most say avoid operation above +40C

There are a number of Lithium battery chemistries. The higher charge concentration chemistries as used in Tesla's are much more unstable and susceptible to catching than LPF. LPF is a very stable battery chemistry. You can find videos on YouTube where they are dropped, shorted, over-charged etc and not much happens compared to Lead-Acid (LA) and other lithium chemistries.

There seems to be a handful of companies in China that make virtually all of the LPF cells. There are a number of companies that assemble these cells into batteries. They will custom build and private label the batteries for you. If you look at the various US lithium battery companies, they say "designed in USA" or "Designed and assembled" not "Made in USA".

You can also buy the cells and the BMS and assemble your own battery to your own specs. There is lots of info on-line about how to do this and the pit-falls. Google Will Prowse for some good info.

I just installed two 100Ahr batteries in my coach and so far I really like them. They charge much faster than LA batteries and have a very flat voltage discharge curve. The Murray sleeps in a heated shop all winter so I'm not much worried about freezing temps.