The Jeep really is not that much smaller than an H3.

 

H3:

Exterior Measurements
WIDTH 6 ft. 2.6 in. (74.6 in.)
HEIGHT 6 ft. 1.2 in. (73.2 in.)
LENGTH 15 ft. 7.5 in. (187.5 in.)
GROUND CLEARANCE 0 ft. 9.7 in. (9.7 in.)
FRONT TRACK 5 ft. 5 in. (65 in.)
REAR TRACK5 ft. 5.5 in. (65.5 in.)
WHEEL BASE 9 ft. 3.9 in. (111.9 in.)

JK Wrangler:

WIDTH 6 ft. 1.9 in. (73.9 in.)
LENGTH 14 ft. 5.4 in. (173.4 in.)
GROUND CLEARANCE 0 ft. 10.1 in. (10.1 in.)
FRONT TRACK 5 ft. 1.9 in. (61.9 in.)
REAR TRACK 5 ft. 1.9 in. (61.9 in.)
WHEEL BASE 9 ft. 8 in. (116 in.)