Good luck.
My appliance store said that there were 2 diagonal screws angling upward front the lower front to the upper rear of the MW into brackets on the rear wall. True, but there were also 3 screws from the upper cabinet over the MW that were only accessible by removing the bottom of the upper cabinet, and there were also 2 diagonal metal brackets from the top of the MW to the rear wall. It took an hour with help.
I've heard that in a front end accident that you should lift your feet for the carnage to happen below you, and then duck before the microwave comes forward. Timing is everything. In my MH the MW is not coming forward.
2008 Itasca SunCruiser 35L
2014 Honda AWD CR-V EX-L