This seems to be working now... -_- feel free to delete this. Thank you for looking into it!

Currently looking into this. I am having a hard time recreating it now. I only used the basic search but I got to a state that had both the model and model_kw populated... -_-

Awesome, thank you for looking into this Nathan. I had already done that and found what I was looking for but figured that a less tech savy person might get stuck. Hope you have an amazing time on your vacation. :)

Working URL: https://www.autotempest.com/results?make=mazda&model=cx9&model_kw=&radius=50&zip=75287&keywords=&minyear=&maxyear=&domesticonly=1&minprice=&maxprice=&minmiles=&maxmiles=&transmission=any&bodystyle=any&saleby=any

Broken URL: https://www.autotempest.com/results?make=mazda&model=&model_kw=cx9&radius=50&zip=75287&keywords=&minyear=&maxyear=&domesticonly=1&minprice=&maxprice=&minmiles=&maxmiles=&transmission=any&bodystyle=any&saleby=any