I'm not sure Hawk and Truman are doubting Bobby. I just think they'd like to know what they're in for ahead of time, as much as possible.
Oh, I never thought they were doubting, I was just wondering if there might be some additional location they're looking for, considering the Twin Peaks' arc doesn't necessarily proceeds in a chronological order. But yup, the most likely thing is that they just wanted to check first.
In all of my theories and searches of the four possible coordinate numbers 48°55'14.2"N 117°26'39.5"W | 48°55'14.2"N 117°26'39.3"W | 48°55'14.2"N 117°56'39.5"W | 48°55'14.2"N 117°56'39.3"W (Which I could find), I left out the last number 8 from Ruth's arm. Simply because otherwise the possible coordinates would't work as latitude & longitude coordinates.
So I was thinking, why would that number 8 be in the number combination? Than I realised, maybe that 8 ain't a number but a symbol. The infinity symbol ∞.
The infinity symbol ∞ is the number of balance and cosmic order, the totality of the universe, new life, final resurrection and so much more. This fits perfectly with the story of Dougie becoming Dale again and the balance between light (White Lodge) & dark (Bob).
An interesting site I found about the Infinity Symbol, that could be a good read is: http://www.ridingthebeast.com/numbers/nu8.php
Now have seeing the end... Seems I wasn't far off anyway back in July. 😀
That infinity number 8 was important.