Thanks guys for the input and advice...this is about the fourth camper I have modified this way and so far I've pulled the first one over 150k miles the last five years with no problems...all the
weight is at the very edges of the shelf and its connected really good if it did
fall it would catch the wall and wedge there...I will keep a close watch on it the first few trips out....it's a tiny camper this Hunter...and this is a tiny microwave probably 600 watts maybe...but I do intend to open the closet door when using it to allow for better airflow and will keep a close eye on it as well till we know it's not going to overheat...and we camp about 3 months out of any given year so we use the microwave a lot...
I don't claim to be good at working on these old campers and I know I lack carpentry skills...I am an aircooled VW mech so I have great mech skills...good welding and fab skills but horrible carpentry skills...I dislike carpentry work...I make these campers practical for us to use and don't take great pain in how pretty they end up...it needs to be roadworthy and have the things that make camping fun and more enjoyable to us...I hack up and modify campers with no intention of trying to resale them...we enjoy them and enjoy camping and meeting other people...I have friends that own professional camper restoration shops and restore 50k Airstreams and Spartans...I redo $200.00 - $800.00 campers and have a blast doing it...