I use an internal SSD in our mobile units.  They take a serious beating and get written to on a daily basis.  No failures yet and we plan to use them for 5 years before rotating them out of service.  Though we haven't hit the five year mark on the oldest ones yet.  Just over three years on them right now I think.
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		