This is dependent on which type of RC's you are talking about. Provide more specific info about what you are looking for (rock crawlers, sail boats, gliders, etc.) so people can give you a more educated response. The more specific the better, don't just say cars because that's too general.
'91 YJ 4.O, Auto, Rr. D60 w/ 35 Spline Alloy USA Axles & Detriot Locker, Fr. D30 True-Trac, 4.56's, 4.5" Deaver Springs, Bilstein 5100's, 1" BL, Rubi Flares, 35x12.50 MT/R's on MT classic II's, Detroit Locker, Vanco Big Brakes, Booster & Master, Warn 9000XDI, York OBA, AA SYE & TW's DS's, Teraflex Belly Up, Rocker Guards...