There isn't any in mine, this doesn't bother me much. Most of trailer cabinets are like this.
Some cabinets are easier to replace than to fix it - and new cabinet will be a better design and quality. Mine doesn't have any shelf where the top of toe-kick would've been. Replacing a cabinet will be bit of work. They are nailed to the floor and walls - probably with ugly split-end #10 screws, so you'll have to mark locations of the old holes to make sure you don't hit the same hole again because floor is usually a particle board, not a real wood. Fill the old holes with wood and glue, leave the flooring. Sometimes they drive the screw from the other side of the wall or from underneath where it's difficult to access. I removed one of dinette torture benches and put a proper chair, benches are attached similarly to cabinets. Chair has made a world of difference, btw - more space, more comfort and very versatile.
While you are at it, consider replacing a cheesy RV plastic sink with stainless (if this is the case) and move it left or right. My sink was in the middle of 36" counter, leaving a useless 6" counterspace on either side, now I have a decent 1ft space and don't have to use flimsy sink cover as a counter.