We put our own residential in last year. In doing so, across the back / bottom framing, I put 4 long #12 screws. Of course you can only do this if you have an access panel to the back of the fridge. Some manf. are kind enough to do so. At the inner top, I riveted L-brackets to the top of the fridge, then secured those into the cabinet framing once the fridge was in. The brackets are hidden by trim. I've seen some of the factory "securing", and it was less than on par. Always good to check if you can.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.