I've posted about it before but it's always good to get a reminder.
The clincher with the rule is not whether your vehicle is over 3.5 tonnes but whether it's capable of being over 3.5 tonne, so even if your MH is itself below the 3.5 tonne limit but you're towing a car then you're probably over the limit.
We use magnetic plaques which go on the cab door but these are no good on the rear right corner which is non-magnetic fibreglass. I used an old fashioned sticky-sticker but applied a thin smear of vaseline to the bodywork before applying the sticker. The sticker held for the 3 weeks we were away, I peeled it off as soon as we got back then cleaned up the area with isopropyl alcohol.
The clincher with the rule is not whether your vehicle is over 3.5 tonnes but whether it's capable of being over 3.5 tonne, so even if your MH is itself below the 3.5 tonne limit but you're towing a car then you're probably over the limit.
We use magnetic plaques which go on the cab door but these are no good on the rear right corner which is non-magnetic fibreglass. I used an old fashioned sticky-sticker but applied a thin smear of vaseline to the bodywork before applying the sticker. The sticker held for the 3 weeks we were away, I peeled it off as soon as we got back then cleaned up the area with isopropyl alcohol.