I've recently become (in the past 6 months) Gold Circle/Presidents Circle and have had 2 really good experiences from the hertz in Phoenix. I walked over to the presidents circle and got an SUV both times.

We are going to Destin this summer and rental prices are really high. Double if I want an SUV and there are 5 of us going. For more regional aiports like this should I expect to find an upgrade that fits us if I book a medium size class? Is it a gamble or is there usually some sort of upgrade? I'm even ok with the $25 choice upgrade (I think that's what it's called) but don't want to get there and be stuck and we cram into say a Mazda 6.

Thoughts? Advice?