The wider tyres certainly are not noticeable when moving, and the new tyres haven't added to the steering effort required, in fact compared to the original old hard tyres the steering load is now lighter. I find keeping the king pins etc. well greased, tends to ease the steering parking speeds input. I always know when the king pins need greasing as the steering becomes heavier. So in my experience the age of the tyres and how well greased the king pins etc. are may affect steering parking input more than the width of the tyres.
