[RC-Monster Mike]

Where did you get the trays? They sound like older trays to me. Our newer trays have rounded corners (where the floor meets the side walls inside the battery compartment), so they are significantly stronger than the original design(been several months or more with this design) - have not seen any broken trays since this style change. All new custom sizes get this style as well. I have never seen the whole bottom come off, but it is nearly impossible with our latest style. Again, I doubt any of your trays were the newer design, based on your description of the breakage.
The tray with the esc shelf on the rear is listed as an option now. :)