Keep in mind that 30 to 50 years has seen a fair change in size of vehicles also. The smaller vehicles are also older styles. A Mack B61 cab was small, very small, compared to what you see on the road today. A Diamond Reo or even an early International cab was not the giant, live-in, away from home, cab you see today. Even wheel sizes and tires have changed. 13' 6" height maximum and 51' length may not have been the case 50 years ago. Think about some of the bridges still around that are over 50 years old.
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