If you passed your test before 1st January 1997, you are able to drive any combination of car and caravan, or any motorhome with a weight of up to 7500kg (or 8250kg with a trailer). If your licence starts after 1st January 1997 then you can drive a car and caravan with a combined maximum weight of 3500kg (or 4250kg to include a small trailer weighing no more than 750kg).
You can also drive a motorhome with a weight of up to 3500kg (with a small trailer of up to 750kg, or a heavier trailer if the combined maximum weight is no more than 3500kg). For all drivers aged 70 and over, the motorhome weight allowance is reduced to 3500kg maximum weight, unless a medical report is supplied.