Mike,
By all means do what you are comfortable with. Increased temperatures do decrease charging time and in theory overcharging could be a concern with “dumb” chargers. I was able to find studies noting a decrease in battery life with increased temperatures. Here is the best study I could find on the subject of heat and battery life and it does support your supposition of the negative correlation between heat and battery life.
https://batteryuniversity.com/learn/article/how_heat_and_harsh_loading_reduces_battery_life
I’m still not willing to take my batteries in and out of our camper. Those darn things are heavy and I am getting old! 🙂 But again, go for it if you feel the need. 🙂
Ardvark
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC
