I get a lot of questions regarding dimensions and stats on the truck itself, so here's a stat dump from Uhaul directly for the 17 foot model (the one I have):

Dimensions
Box roofline inside: 16' 8"
Box floor inside: 14' 1"
Box inside width: 7' 7"
Box inside height: 7' 2"
Box deck height: 32"
Box outside width: 8'
Box outside height: 11'
Box floor width: 7' 7"
Width between wheel wells is: 48''
Wheelbase: 176"
Loading ramp length: 10'
Loading ramp width: 26''
Loading ramp inside width: 25''
Back of cab to centerline of axle: 109''
Centerline of axle to back of box: 70''
Bumper to bumper length: 24'
Rear door opening height: 6' 5"
Rear door opening width: 7' 3"
Roll Up Rear Door
Capacity
Empty Weight: 8,120 lbs.
Gross vehicle weight: 14,050 lbs.
Hitch rating: 10,000 lbs.
Cubic capacity: 849 Cu. Ft.
Payload: 5,930 lbs.
Fuel
Engine: 6.8L V-10 Gas, 10 cylinder engine, 362 H.P.
Multi-port electronic fuel injection
Transmission: E40D / 5 speed automatic with overdrive
Auxiliary Transmission Oil Cooler
Differential: Dana 4.56 Ratio Regular Axle