Weighing in way late here and hope by now you have solved your tripod issues. That being said, I would offer some points of interest that might be of help to others. First, carbon fiber is the way to go if any heavy payload is anticipated. Many of us have gone through this and have discovered that cheap and light weight for the most part will not get the job done and I include ball heads with this statement. the required tripod for such operations here can start at $M dollars. After acquiring my 600MM lens I decided on a "Really The Right Stuff' T35? -- it will get the job done and even an old guy like me can carry it all day.
100% made in the USA, right down to the last screw, which was important to me. When I first went looking the well known 'G' brand was not to be had anywhere for some reason. After several years of across the country use I have not one complaint or issue with it. Add a quality heavy duty ball head and you have a winner. You will be nothing but disappointed with the cheaper selections. Also, on longer lenses, an after market base will allow you to more correctly balance your equipment for use. These are just my thoughts on these matters and others may have their own experiences. GOOD LUCK!!