AT tyres Heat Problems

Ive just put a new set of tyres on my Landy the coopers i had on were perishing badly and cracking in the walls they were only half worn but in their defence i think they have been on the vehicle for years .Suprisingly the spare which is bolted onto a spare wheel carrier on the back of the car was like brand new the rubber was still suple etc , this leads me to one conclusion , I reakon the tyres were absorbing road heat and that stuffed them ,my son has bridgestones on his triton they are also older tyres and they are doing the same maybe slightly worse , So i needed a new set of tyres ,I went for a set of Falcon AT3w i think these have silicon blended with the rubber i reakon it will handle the heat a lot better as it really gets hot up here in Darwin , the reviews on the falcons were very positive , ive noticed zero road noise since fitting them i also took them out in the mud for a good 10ks all first and second gear , very slow going but the tyres handled it extremely well . They had problems with one of there tyre models but they recalled and rectified it but this hasnt helped the brand , they seem to be a tyre with a budget price but with performance to equal the big boys I guess milage will tell.