Rear kitchens layouts offer a residential feel since they can take the full width of an RV. An adjacent slideout can make it feel even larger. Many floor plans now offer a rear window.
Benefits
More counter space than a mid kitchen layout
Separation of space between kitchen and living area
Can take advantage of taller ceilings for extra storage
Considerations
Refrigerator may be inaccessible with slideouts retracted
Be careful with glassware! The rear of a fifth wheel absorbs more bouncing on rough roads.
A separate gray tank hookup may be needed for kitchen waste water