where are you measuring that 7' ? the factory measurement is inside - eg: the length of the bedwood, 78.25" or 6.5' from the factory .... a Longhorn was the larger 3/4T [C20] aimed at the camper crowd
a C10 is the 1/2T [long or short] series, C20 is a 3/4T [longbed 98"(8.1'), or Longhorn 104"(8.6')], C30 is a 1T [long only 108.5"(9')] - further numbers are used to differentiate the details ....
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