Battery Disconnect Switch
Unless your load can also be split in half, I would not recommend splitting the supply in half by using two switches. I know this suggestion is going to be crude and some people would definitely take issue with it, but I've done it myself in a pinch (to control a 24VDC 2hp motor @ 60+amps). I just took a DC circuit breaker that I found on an old solar charge controller setup. They don't cost too much and also offer your over-current protection. See solar suppliers (such as https://www.wholesalesolar.com/circuit-breakers) for a selection of high current DC breakers, though you can probably find cheaper ones that aren't for a specific market like solar.