Lexus LX570 needs a heavy duty battery – any recommendations near Burj Khalifa?

I drive a 2016 Lexus LX570 which has a massive V8 and lots of electronics. The current battery is struggling to crank especially on hot afternoons after the car has been sitting in the sun all day. I think I need a higher capacity battery than stock because I added a fridge and extra lights for camping. I’m looking for an 80AH Battery Replacement in Downtown Dubai because I work near Burj Khalifa and can’t afford to have the car die on me during the work week. I saw Amaron’s battery page and they seem to have heavy duty options. My question is, can I go to an 80AH even if the stock battery was 70AH? Will the alternator handle it? Also what’s the best brand for extreme heat and off road use? I’ve heard Amaron is good but also considering Varta or Bosch. I need something that can handle deep discharges when I’m camping. Any LX or LC owners here with experience? Would appreciate real world advice before I spend money. Thanks.