I thought the RTC dampers were the ducks guts, but sadly have been proved wrong on 3 out of 4 occasions and to this end i am going a Dobinsons steering damper on my comp GQ.
I have one on my FJ62 5.7l and one on the missus SPOA Zook both of which have blown the seal and leaked oil everywhere and are cactus, they were only 4 months old!
Admittedly we did do a sprint comp in both rigs and that is when they blew, my mate has one in his 80 comp rig and that has worn the outside of the damper that much with the spring that it is weeping oil as well but his is about 6 months older than ours.
This is only my personal experience with them, and i am not a real fan anymore so thats why im going the 41mm jobbie from Marty at Dobinsons in Sydney, from what ive been told the bigger the shock the longer it takes to heat up, and if it heats to much then POP go the seals.
I think the RTC ones sacrafice the size of the damper so they can fit the spring on and still have room for everything to clear and that is were the problem is.
Have fun
Steve.
GQ Space Cab V8. Team Toxic, Sponsored by Dobinsons Suspension Sydney 02 4647 8295 Loveday 4x4 Adventures, Sharmans Engineering, Lightforce, R&B Tiling Services, CW Crash and my long suffering wife.