Last month we purchased a 2017 Rockwood Mini Lite 2504s! We were able to compare the 2504s and 2509s as they were parked 3 feet from each other on the lot!
We had intended to get the 2509s (due to the wider bunks) but after comparing them item by item the 2405s won out hands down for us.
The 2509s has wider bunks plus an outdoor kitchen. The 2405s has thinner bunks and no outdoor kitchen. Instead the 2405s has a slide bar and propane fitting at the midpoint of the trailer (beneath the awning) that allows you to mount the grill to the trailer and use the trailer's propane tanks. The lack of outdoor kitchen on the 2504s allows the entire space under the lower bunk to be for storage accessible from inside and outside the RV. The outdoor kitchen on the 2509s uses up almost the entire portion of this under bunk storage. The 2504s has a extra cabinet over the sink area that does not exist in the 2509s. Finally, the bathroom in the 2405s is larger due to gaining the space given up by the thinner bunks.
I will always go for more storage! The 2405s has at least 20% more storage than the 2509s. The second reason we liked the 2405s was the larger bathroom. The third reason the 2509s was ruled out, we felt the outdoor kitchen was a waste for us. We grill A LOT but the sink was of no use and the refrigerator was redundant as we keep a cooler full of drinks on a rear bumper rack. We did purchase a removable extension for the propane hookup under the awning that enables us to grill further back off the rear of the trailer. We prefer not to grill under the awning or right up next to the trailer due to the smoke/soot/grease/splatter.
We bought and use the 2504s for the extensive traveling we do for our 11 yo daughter who plays competitive Fastpitch softball. She is tall (5'4) and fits comfortably in the bunk. We have also traveled with her 13 yo BFF in the second bunk and both said they were comfortable and didn't indicate they were too narrow.
We really love the trailer and are satisfied we made the correct choice. Hope this helps in your decision making!
2017 Rockwood Mini Lite 2504s
2016 Chevy Tahoe