To save some time and detail spray, I would just clay the truck before you dry it from the wash. Just use the same soapy water to lubricate the clay bar. Youll save a lot of detail spray this way, and time because you wont have to dry it twice.
Theres really no need for detail spray after H2O gg. I feel like H2O is kinda like detail spray on steroids, it protects better, it dries better, and it shines better. The only time I use detail spray over h2o is when I work a bit slow and the h2o dries out, I use a little detail spray to help wipe the h2o gg off.