Mercedes Burford Duo

Can anyone advise me what the axle details are on the 2019  Burford Duo, we have a Corinium Duo now at 3850kg 
but the back axle is 2000kg and we are slightly over that so looking at changing, and would look at fitting a tow bar as we tow a A-frame, and don’t want to make an expensive mistake
Mass of front axle in running order
Mass of rear axle in running order
MTPLM front axle
MTPLM rear axle
Mass in running order 

Thanks

Front - 1800kg
Rear - 2430 kg

https://orbit.brightbox.com/v1/acc-jqzwj/Auto-Sleepers/handbooks/handbook_documents/000/000/018/original/2018-Burford-Duo-handbook.pdf?1560167392

PLOUGHLIN wrote:Front - 1800kg
Rear - 2430 kg

https://orbit.brightbox.com/v1/acc-jqzwj/Auto-Sleepers/handbooks/handbook_documents/000/000/018/original/2018-Burford-Duo-handbook.pdf?1560167392

Thank you