As above.
Basic answer. XX7 and XU3 are both Sandman codes.
XX7- passenger tyres- lower GVM
XU3- commercial tyres- normal GVM
N and M are irrelevant here.
XU4 - not a Sandman, but has passenger tyres and therefore a lower GVM.
As for your idea, it's a good one for other forums but don't think it would work well in this case. Things would get lost in amongst all the various questions and confusion might take over.
May I suggest you do a thread on your own van, and simply ask all your questions in that thread. That way all answers should be relevant to your van.
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