I gigged a single svt 4 for 10 years, and never did more than replace the preamp tubes, including dropping the rack case (gator) literally down a flight of cement stairs. So for me it was reliable. Eventually I replaced it with a CL. Now I play D minis.Reliable would be anything that's not rack mounted and says Ampeg on it lol
Likewise not putting heads into bouncing rattle bucket trailers when touring.
Transport in foam lined cases or at least on some foam in the van or actual tow vehicle.
I'd literally buy a pair of any known reliable cheap lead sleds. One for stage ,one for back up.