I have an Elddis Odyssey 482 weighing in at MTPLM 1325kg and tow it with a 2006 Passat 2.0 TDI saloon (140 bhp) with a kerbweight of approx. 1570kg. I am thinking of increasing the bhp to 170 by remapping, has anybody out there had any experience with remapping, and would it make any difference...