The last time I had all wheels aligned was by Sly maybe just over a year ago. I am not sure whether I'd need to align them again, but I remember when he did it, he said that they required a fair amount of adjustment. (Apparently hadn't been done by previous owner, and Nissan don't do it usually). As for weighting, I did have new tyres put on recently, but I imagine they would have weighted them correctly as it was done at a professional shop.