Swivel seat would be a great selling feature. Particularly if you do a lot of brush cutting. Old persons like me would pay a premium for that option. Max safe roll angle is going to have a large variable depending on surface irregularities and speed.... one hidden large rock or dip could put you over the edge. I too ride on the conservative side of the scale. The pucker factor is enhanced due to sitting high on the cab platform vs. nestled down between the fenders straddling the transmission. You do have the incorrect toolbox bracket. Mine opens with room to spare.