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Stiffer springs along with stiffer shocks and strut inserts will help a lot. But beware, most springs for the RWD 84-87 Corolla SR5 and RWD 85-87 Corolla GTS will also lower the car 1" or more.
On a side note, you've posted a lot of really weird posts with the "AE86" icon, are you really towing trailers and shuttling around 4 "portly" adults in a GTS or SR5 coupe or hatchback? If you are, I'd really suggest saving some money and getting a more comfortable and capable car or truck.
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Physics for your head!!
2000 Camry XLE 5-Spd 
1985 Corolla GTS Coupe
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