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Typically wheel wells are at whatever condition is occurring outside since to do otherwise is hugely expensive and complex. Those are 20 ply very high pressure tires so they don't move all that much.
Many tales of frozen bay stowaways being recovered at destinations. So they aren't that warm.
The retract system is very complex and prone to all sorts of failures so leaving the bay doors off helps lower maintenance on high cycle planes like the 737.
Gear drag is probably higher than a pickup truck equivalent.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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