a possible hz sandman but how to be 100 % sure ?

[playwme]

Any idea what the number on the glove box sticker represents?
paul

That's the tyre placard. An XX7 HZ is fitted with passenger car tyres so the tyre placard is different to most normal commercial vehicles. The number is the part number of the tyre placard so thats why it's a good indicator of a Sandman. The number you posted looks similar to mine from memory.

Even though Byronhas already confirmed it, another good thing to look for is evidence of the painted blackouts. Also, the door handles on a Sandman are Black instead of chrome.