Signum 2.8 v6 as a towcar

Does anyone toe with a Signum 2.8 v6 Design?  If so how do you get on?  I use this model which has a kerbweight of  over 1700kgs (including factory fit extras) to toe a 2011 Swift Challenger 530 ( MPTLM of 1615 KGS)  I realise that this combination is over the 85% guide but as long as I am careful with loading I have no problems. The 2.8 engine is great, has plenty of power and torque and will push the van around for parking on tickover.  I would like to know if anyone has used one of these and then bought a 4X4 and how they compare?