As always, thanks for your help 😀 I am about to pull the plug on getting the 608 Nitrotech Head with 645 fast legs, but trying to decide if its worth paying ~$200 extra for carbon fiber.
Also, we may need to go a little higher than the max height of the 645 in the future. Do you recommend getting 475B instead of the 645? The install is almost permanent, so little to no moving of the tripod around but I think a dolly with the 645 will give us the few extra inches required. We do have limited space, so a tripod with a wide base won't work for us.