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Yes that is true. The cord does generate heat when working hard to deliver it's capacity. When the outside temps are high and You are running the a/c and other appliances the cord can become warm, the cord coiled up can create hot spots and could cause a fire. This problem is more prevalent with 30 amp service that is maxed out. As for this happening with a 50 amp cord, I don't think it's very likely in our situation. If a lot of power was being consumed then it might become one.
Many busses and larger class A's have cord reels bulit in and only the required length is unwound. If this was such a problem then a fire would be more likely to occur in the storage compartment that the reel is in.
John
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