The Isuzu NPR Eco Max is availalble in two sizes, approximately 12k and 14.5k GVWR, and can carry around 6-8000 lbs of payload.
There are gas and diesel models available, but the exo max is strictly diesel, more suited for companies logging a lot of miles for their cargo transport.
The isuzu is a little bit beyond delivery vans and trucks that a small business might use, but is still perfectly suited for the Cooler Ice Cube, and will save you substantially over doing a refrigeration conversion.
Here are some links to get some more in depth info on the Eco Max and the Isuzu NPR line:
http://www.isuzucv.com/en/app/site/pdf?file=n_brochure.pdf
http://www.isuzucv.com/en/nseries/diesel_features
http://www.isuzucv.com/pdfs/gas_specs.pdf
Cooler Ice Cube Model Specs
CI01U
Appcicable for box with overoll dimension (in) 59x39x43
applicable for box with volume (L) 1000
Cooling capacity
(ambient temperature 80 F) 35.6 F 1194Btu/hr
-0.4 F 682Btu/hr
Ciculating air flow inside the box 131CFM
Power supply DC12V
AC115V/60 Hz
Refrigerant R404A
Temperature control range inside the box -0.4 F~5 F
Ambient temperature range -22 F~104 F
Max power (AMPS 12V DC) 26A
Average power (AMPS 12V DC) 11A
Unite overall dimension (in) 35.4×31.4×10.6
Unite weight 287 lb
CI02U
Appcicable for box with overoll dimension (in) 59x43x43
applicable for box with volume (L) 1100
Cooling capacity
(ambient temperature 80 F) 35.6 F 1194Btu/hr
-0.4 F 682Btu/hr
Ciculating air flow inside the box 131CFM
Power supply DC12V
AC115V/60 Hz
Refrigerant R404A
Temperature control range inside the box -0.4 F~5 F
Ambient temperature range -22 F~104 F
Max power (AMPS 12V DC) 26A
Average power (AMPS 12V DC) 11A
Unite overall dimension (in) 35.4×31.4×10.6
Unite weight 298 lb
CI03U
Appcicable for box with overoll dimension (in) 59x47x43
applicable for box with volume (L) 1250
Cooling capacity
(ambient temperature 80 F) 35.6 F 1604tu/hr
-0.4 F 853Btu/hr
Ciculating air flow inside the box 131CFM
Power supply DC12V
AC115V/60 Hz
Refrigerant R404A
Temperature control range inside the box -0.4 F~5 F
Ambient temperature range -22 F~104 F
Max power (AMPS 12V DC) 30A
Average power (AMPS 12V DC) 15A
Unite overall dimension (in) 35.4×31.4×10.6
Unite weight 309 lb
Specs
GVWR/GCWR 12,000/18,000 lbs.
Body/Payload Allowance 6,315-6,453 lbs.
GAWR
Front 5,360 lbs.
Rear 8,840 lbs.
Front Axle Capacity 6,830 lbs.
Rear Axle Capacity 11,020 lbs.
Ratio 5.125
Suspension, Front & Rear
F/R Springs Tapered/Multi-Leaf
Capacity 6,830/9,880 lbs.
Frame
Section Modulus 6.07 in.3
Resistance Bending Moment 267,080 lbs.-ft./in.
Service Brakes Vacuum/Hydraulic with 4-Channel ABS
Front/Rear Disc/Drum
Exhaust Brake Standard
Transmission
Standard Aisin A460 6-speed auto with double overdrive and lock-up 2nd-6th gears
Optional N/A
Engine Isuzu 4JJ1-TC turbocharged intercooled diesel
Displacement 3.0 L (183 in.3)
Engine Power 150 HP @ 2,800 rpm
Engine Torque 282 lbs./ft. @ 1,600-2,800 rpm
Oil Level Indicator Dash-mounted oil level check switch and light
Limited Slip Differential Optional
Alternator 110-amp
Batteries 2 Maintenance-Free, 750-CCA
Tires 215/85R-16E (10-ply)
Steering Integral Hydraulic Power
Steering Column Tilt & Telescopic
Fuel Tank
Standard 25 Gal. in-rail
Optional N/A
Fuel/Water Separator Dual fuel filter with dash-mounted indicator light.
Dimensions
Wheelbase (in.) 110.0, 133.7, 151.4
Cab to Axle (in.) 87.6, 111.2, 128.9
Cab to End of Frame (in.) 129.8, 153.5, 171.2
Back of Cab (in.) 4.5
Overall Length (in.) 200.6, 224.3, 242.0
Body Length (ft.) 10-12, 14, 16-18
Overall Width (in.) 81.3
Axle Width (in.) 65.6
Overall Height (in.) 90.8