I don't know for sure if you can use the people insect repellent on Drake Souraya, but I would get him some special stuff. The stuff people use is pretty toxic I think and we dont' normally lick ourselves! You have him on flea/tick medication I'm assuming? Like the Frontline/Advantage type? And for the flying/biting stuff maybe you can get him something like they use for horses?

Have a great time! I'm so glad you're bringing him and I think you are too since you sound so excited!! Dont' forget his licenses and his rabies certificates in case you need them at the campground or to get into any state parks or the like. And maybe one of those tie-outs that stick in the ground in case. I know alot of campgrounds require the dog to be tied up and they won't allow you to tie them to the trees.
You didnt' mention his food? That's a given I assume!

When are you leaving? Drive safe and enjoy!