At least on mine, Mercedes Benz put the stock bottle jack and tools under the passenger's feet. Just pull out the floor mat and there is a access cover in the floor where passenger would put their feet. Jack and tools are all in there.
I don't think the bottle jack would handle a fully configured Class C MH, but it helps me get the spare back in after taking it out. The spare is stored toward the rear of the MH frame, behind the rear wheels. The spare tire frame is a wonder of German engineering as you loosen two nuts and it hinges down and allows you to slide the spare off at ground level. Instructions are all in the Original Sprinter Owners manual, which came with the MH, but you can download a PDF version from the Sprinter owners website.
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