Yes, from what was stated above, it does appear that your Sprinter Van Conversion does qualify as a second home. The main point of concern seems to be the portable toilet. Below are 2 links that I believe can assist you should it be questioned as to if it qualifies as a second home. One is from TurboTax, and the other is from a legal perspective:
RV as a second home per TurboTax
Legal perspective of portable toilet
@cdrunner
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