In an out-of-the-way area, where there is a picnic table, but no other facilities, you will find what you’re looking for. Being TALL will be an advantage, or cyclists could use their transport, otherwise you may have to be inventive.
If you think the rating needs to be adjusted please let me know.
The service centre does have toilets and showers available 24/7 through an entry on the western side (that the truckies use when the main part is closed).
Please Note, no more than 10 (TEN) Newtons force is required to access this cache. Lift a 1.25 litre of soft drink up, and that is 12 Newtons effort, so DON'T abuse the structure! Rather, use team work, or a TOTT.