Hi Eileen
I do not have first hand knowledgeof the 406 but form freinds that do it would seem to be a capabile tower,Whatever unit you have it is very improtant that you use the 85% rule,To find this : kerbweight of car =a
divided by 100=b
b multiplied by85 =towing weight of vehicle,
allso watch nose weight
this will be in car hand book and caravan book, you must choose the lowest figure of the two if they do not match, keep all haevy items below waist height..ie over axel. have fun. If you need any more help come back