My German teacher, when pressed about endings, sagged in resignation and said, "
Look, the ending -en is the most common one so if you are really stuck, use -en as the ending and you have more than a 50% chance of being right."
Looking at the table you can see out of the 48 possible endings, 26 of them are -en.
I always swallow my endings in a Swiss-German type of a way anyway but the cheat thing has always served me well.