Make sure your return duct is fully open, I was having some issues last year and my 4 return air vent were about half closed, I bought 1-1/2 pvc couplers and installed them as far as I could reach and it really help with the air flow. It was 105 today here in San Dimas Ca and it 73 in our 2017 3160RL. Our coach door side faces west and we do have trees that partly block the afternoon sun.
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2018 Ram 3500 MegaCab 4x4 Aisin, 4:10 Gears
Titan 50 Gal Tank, Air Lift Wireless Bags
2017 3160 RL
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