I have been given the task on two featherbeds for installing cafe tanks and seat. There is no real method of doing so.. no special brackets , nothing. It is entirely up to the owner. I have been through a few dozen pictures of and there is very little to be seen. I finally welded in a small crosspiece on the frame for a place to mount the front of the seat and the rear of the tank. It works well but I am curious as to what other people have done.