Originally Posted by tabetha

By wishbones do you mean the semi trailing arms ?, if so no they are plenty strong enough.
Some say that you need to strengthen the tower tops/area, where the bolt that secures the top of the shock to the body is, I never have myself and despite having towed like this never had any problem.
I would defo recommend a strut brace here though, ideally triangulated from the tower area to the centre of the boot floor under the strut brace, but even a staright strut brace would be a wise move as the suspension movement will try to impart a force pushing the towers towards each other.
tabetha