It depends on where and when I am touring.
For an East to West TA with a May 5 start, I would have wool arm and leg warmers. Probably rain pants. No slacks. If I was going West to East starting in early June, I'd have wool tights for sure. Maybe tights in early May in Appalachia. I was hiking in them in early May last year and it was very cold. I would consider bringing a light quick drying pair of hiking/jogger pants like the 9 oz pair from Arc’teryx. I would not bring two pairs. Personally, I rarely do two of anything on a tour.
If I were touring in an area and style where I'd be eating in nice restaurants, I'd have a light pair of pants and a polo. Like Europe or maybe Inn to Inn in Vermonty kind of places.