Nexen CP 321 Tyres

Hi,anyone used these? Currently looking to replace Tyres and stumbled on these, by title thought they were a new camping tyre but appears not just confusing number . However have fired question off to Nexen about them checked on line and asked local stockist. It states heavy duty tread shoulder to cope with heavy loads. Tyre dealer checked against Agis camper and load characteristic exactly the same,1112kg if I recall and ply quoted as 8 the same. As dealer says the Agis is an old design that has not changed, guess they would not continue developing an existing product whereas the Nexen is a newer release so may benefit from latest technology. Whilst waiting for Nexen response wondered if anyone had any experience of them. They seem to get good numbers from the tyre rating sites 

thanks

Geoff