According to the guy who installed it, there is an L-bracket mounted to the top of the fridge and accessed through the old fridge's roof vent that is the primary "anti-tip" device. At the front bottom edge there are a pair of smaller L-brackets to keep it from moving forward. We've driven more than 10,000 miles with it in place with no difficulty. There are no brackets mounted on the sides.
We have 4 6-volt batteries and the 100W solar on the roof and with the coach's alternator the batteries hardly seem drawn down at all at the end of a travel day regardless of how many times we stop, etc.
Even though ours was installed in Spokane it was shipped there from New Jersey having been bought from AJ Madison, one of the country's large online appliance retailers. It was difficult to find even last September. We replaced the microwave-convection oven at the same time, so the two things together were enough to get free shipping. It takes ~10 days to get something like that shipped cross-country.