They are ok, seen a lot worse, near new tread but some age related cracking. If I ever decide to get it spayed up then they will get replaced first, but they should be fine for what I have in mind for it at present.What condition are the rear tyres??
As there will be a considerable load when topper is raised
The flail is 225kg according the the spec sheet - so I think it will be fine for the Fregi, certainly wont worry the 135 if I have to resort to a live drive tractor. All the flails for the compact / cat 1 tractors I have looked at come in at a similar weight.