I use two tripods regularly. My favorite is my Gitzo Reporter with a Manfrotto Pro Ball 308RC. I use this combination for hiking with either medium format or my Wista 45DX. This combination is pretty solid even with a 120mm Super Angulon stuck on the Wista, but then the Wista is a lightweight camera.
My other pod is a Bogen 3030 with a 3047 head. I use this for all formats up to 5x7 and it is a solid combination even with my Ansco 5x7.