I don't like checking cameras or lenses, but if I had to, I'd probably use a Pelican case.
I do check my tripod regularly, usually with the head on but the handles loose (unless it's my Arca-Swiss B2, which I carry on in my camera bag), in a Tenba TTP34 case, which I recommend highly. I've checked it many times, and I've watched from the gate as that bag has gone flying off the top of a baggage truck making a sharp turn up to the baggage loading ramp, and everything's always come through without damage, and it is a fairly lightweight case, so it's easy to transport through the airport. It's big enough for a medium sized tripod like a Gitzo 3 and a couple of light stands, but if I just have a tripod, I often put clothing or other things in there.