Hey Tom!
The overall dimensions of the MORryde RV Cargo Sliding Tray - 48" x 42" # MR73FR are 48" long x 42" wide x 6-5/8" tall (see attached) - this is for the tray and the rails when they are assembled and installed together.
Since this is a bit longer than what works for you I recommend picking up the Rail Kit for Kwikee SuperSlide II RV Storage Slide Out Tray Assembly # LC370782 and pairing it with the Tray Trim Kit # LC370690 which gives you more of a custom setup that will fit within... view full answer...
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