Hi Travis:
According to the elusive "Page 109" of the '68 owner's manual the overall
height of a Caravel is 104". All the other models are 106" Lower tire
profile on the Caravel maybe? 7:75 vs 7:00 on the others. The hitch height
is 1" less too: 18" vs 19".
The inside height is not mentioned but the measurement that I took of the
inside of my '67 Safari (should be the same as '68) is 79 3/4". I suspect
that is what the Caravel is too. Worst case is that it is 1 or 2" less.
Note that dimensions for the '69 and later models are apt to be quite
different than the '66 - '68.
I can send you a copy of the '68 Pg 109 if you want. Lemme know.
Have fun,
GQ '67 Safari
4082 in CA