Unfortunately, it won’t fit anything except the RR. It uses coil springs in the rear. Other trims use leaf springs. The 35 gallon tank is for coil spring fitment only.
All Y’all just need to move to a state that is always stupid hot outside. It’s, on average, about hot as B@lls here in SC pretty much all the time. My ASS never engages due to needing to keep my A/C on. I just run it on max and turn the fan to like 2 or 3 and no ASS issue.
I have the 2WD XLT. I use it 100% for my mobile repair business. I have almost 3k on it now and average 22-24 mpg I have a fully packed Decked system in the bed, too. I sometimes tow a trailer and average about 19.5 mpg with it loaded up with a golf cart in Tow/Haul mode. I love my fuel economy...