Trying to think of possibilities for you...are the rabbits legal where you live? That is, you're allowed to raise them in the yard and all that?
1) If so, then a member of Pet Sitters International should be able to deal with it. But!!! You'll want someone recommended by another rabbit raiser for sure. That way, the chances of the pet-sitter being an ARA go down a whole lot.
2) Do you have a vet for the dog and the cats? Many vet techs earn extra money by taking care of clients' animals during their hours off. A rabbit vet's vet technician might be a perfect person IF you could ascertain the "animal rights" attitude while at the clinic (this is all assuming the rabbits and their set-up are legal).
3) Do you have a rabbit-raising contact nearby? (within a 20 to 30-minute drive, that is) You could ask this person to cover for you in August and you could offer to cover for him/her during an equivalent period of need, either beforehand or in the future, after August.
If the rabbits and their set-up are not legal or are pushing legality (OK under some ordinances, questionable under others kind of thing) you might need to depend on automatic watering systems and feeding systems for those few days.
But don't give up! There may be 4-H kids or FFA participants who'd like to help out. Check out those avenues; if not the kids themselves, perhaps a mother or two would like some $ for taking care of rabbits who won't take a chunk out of her arms....
And heck, depending on where you are in Nevada (north?), I might drive over for a little knitting/crocheting/quilting weekend with bunnehs and mah own dog. I've taken care of elderly cats to the extent of subcutaneous fluid administration and oral syringing. So, if all else fails, we might be able to figure something out. I sure won't rat anybody out to the Law if the rabbits are well kept. (Good food, clean water, fresh air, sanitation, protection from sun/wind--the basics.)
So there are six options, right there.
Hope some of them sound good to you!