Hi James,
Since Sprinters (even those with MH bodies) all started life as delivery vans or cab/chassis, they are set up to conform to ICC (Interstate Commerce Commision) requirements for commercial delivery vans.
Yours started out as a cab & chassis, which could have an RV body, or a box van body, flatbed, utility service body, placed on it by the outfitter at their plant (not the plant where Sprinters are assembled).
So, it needed to conform to the ICC Regs.
Since it was converted into a motorhome, the ICC regs really do not apply to your vehicle.
One of the requirements in the "ICC Package" is the 3 red reflective triangles in the red plastic box that fits perfectly in the brackets and under the strap behind the drivers seat.
My '06 T1N 3500 SHC (158" WB) was originally built for commercial delivery service for one of the major office supply companies.
They decided they didn't want to get into that business in some areas, so I got my van with 200 original miles on it, all outfitted as an "around town" freighter.
It came with the fire extinguisher in the rear of the LH foot well (just inside the drivers door) and the red plastic box with the emergency triangles.
I'm sure you've seen an 18 wheeler broken down somewhere with the reflective red triangles out behind as warnings.
If you want to see the box and what's in it, send me an email and I'll take some photos of the box and triangles that came in my van.
Roger