Any thoughts on the suitability of a Bogen 3021 tripod for 4x5 field work? I am just starting out in large format and currently have a Busch Pressman, but I am thinking of upgrading to a Tachihara or a Wista field camera. I will backpack on occassion with my equipment. Also, any thoughts on a head for this tripod, i f it is in fact appropriate? What about a 3028?