The data below is directly from the Lithionics data Sheet. These are industry standard temps for storing Lifepo4. If you use your trailer/batteries at least every 3 months then they will be fine unless they will experience extreme low temperatures. Saying that you need to remove them from your trailer is simply incorrect. The only time you would need to remove them would be storing for periods greater than 3 months at which point it would just be easier and more beneficial to just give them a full cycle.
John
Storage
Storage Temperature &
Humidity Range
< 1 Month -4~95°F (-20~35°C), 45~75%RH
< 3 Months 14~86°F (-10~30°C), 45~75%RH
Recommended
storage
59~95°F (15~35°C),45%RH~75%RH
Long Term Storage If the battery needs to be stored for > 3 months the voltage should be 13.2V
(50%SoC) and stored at the recommended storage specifications shown
above. Additionally, the battery needs at least one charge & discharge cycle
every six months.
Self-discharge rate Residual capacity ≤3% per month; ≤15% per year
Reversible capacity ≤1.5%per month; ≤8% per year