Take a look at the Scanvogn 420 Disability 4+1 Trailer.
This trailer features 4x regular toilets + 1x disabled toilet to the rear of the trailer. The toilet system within this model is a Jets Vacuum Toilet System with two onboard waste storage tanks.
The disabled toilet has an easy access ramp as well as grab handles and enough space inside for a wheelchair.
Learn more about the range of Scanvogn Disabled Toilets here: