My caravan is heading down the A5 to the coast this summer. Should I change the tyres?

Probably, if they are more than five years old. Caravan and motorhome tyres usually fail on age rather than tread, because they sit still for months, take the full weight on one axle and develop sidewall cracking long before the tread wears out. Check the four digit DOT code on the sidewall for the week and year they were made. We can look them over at Llay before you set off over the Horseshoe Pass or down the A5 through Llangollen, and fit the correct load rated replacements if they need doing. See caravan tyres.