i don't know if you'd call it fair, but when i do that much work along with cleaning the engine - my price for that is $200. that's what i charge for all of what you're describing. if you're gonna do the work yourself, i'd say you're looking at a minimum of 4hrs. and more like 6hrs. to do it right. besides that, i'm assuming you'll be using your own products? if this seems high to you all i've got to say is i wouldn't do it for less than $100 - your time and effort are worth at least that.
If its a buddy then probably around $120. If its not a buddy then between $150-$175. Thats a lot of time when you are talking about clay and SMR. If you want to make $5 bucks an hour then you could probably do it for less but to make any money at it then it is going to cost. Normal detail shops will charge you nearly $100 just for an SMR job. That isn't including clay, Zaino, or any interior work. I think that $150 would be a fair price for that much work. Especially if you tell him to shop around for prices.
That much work would be around $160 for me to do. Little bit more if he has one of the big bedcovers on it. They are hard to get up that high to do the whole roof area.
If you perform all the steps mentioned, you're looking at AT LEAST 6 hours. Trust me I've done it. Only difference is, I used Klasse AIO & SG instead of Zaino.
Any detail shop around here would charge no less than 250.00 for a full size extended cab pickup.