Keeping it Cold

I've agreed to do the beer for my best buds wedding; here's a previous post explaining the circumstance in more detail. A bit has changed with the lineup and procedure since my last post, but it's still the same idea.

https://www.homebrewtalk.com/f14/brewing-wedding-305916/

Here's my question:

How am I to keep 10 Kegs cold during the heat of August in the middle of nowhere (30mins away from the nearest town)? I'm thinking a trough loaded up with Ice...which seems a bit expensive and risky if it melts throughout the day and night. The beer's gotta' last from noon-sunrise. Anyone ever rent out an ice machine?

Thanks

there's no power? no lights? no music?

No refrigeration. Lights and tunes of course.

Check with a smaller town butcher shop or meat locker about renting a refrigerated box truck.