i would, i can for the most part reach half of the roof standing on the running boards, im not super tall either. No complaints waxing the roof, the real pain was taking care of the rubber seals for the sunroof.
Thanks for that, may get that specifically for cleaning the underside
Consider something like this for the underside instead.
RIDGE WASHER Pressure Washer Undercarriage Cleaner, 16 Inch Undercarriage Washer, Pressure Washer Under Car Cleaner with Straight Extension Wand, 4000 PSI
Last year I went with a Ryobi myself. I haven't used it yet because pressure washer problems came up and in the winter I'll just use a touchless wash I found that has underbody for $5. The one above comes with the extension wand, costs less, and is 16 inch wide while Ryobi is only 11 inch wide.