And nothing to do with them.
I would luv to see a M-18 Hellcat tank destroyer. It had a high velocity 76MM cannon and was blazing fast. 45MPH to 50MPH. And was produced in high numbers with over 2500 produced.
Here are some details. 
Used by tank destroyer battalions in Europe. It was intended to be used in an ambush roll with its quick speed.
It first saw action in the Summer of 1944 in Europe. One unit to use it quite effectively was the 630th Tank Destroyer Battalion in July 1944 reported destroying 53 Panthers & Tigers and 15 self propelled guns with only a loss of 17 of their M18s.
Could penetrate 101 mm. Muzzle velocity 2,600 ft/sec. 
Crew Commander, driver, gun crew (3) 
Physical Characteristics   
Weight 40,000 lb 
Length w/gun 21' 10" 
Length w/o gun 17' 4" 
Height 8' 5" 
Width 9' 9" 
Ground clearance 14" 
Ground contact length 9' 8" 
Ground pressure 12.5 psi 
Turret ring diameter   
Armament (mm)   
Main 76 mm M1A1, M1A1C, or M1A2 
Secondary   
MG M2 .50 cal Browning M1919A4, AA 
Side arms M3 .50 cal Tripod mount
5: M1 Carbines
Grenades
Smoke Pots 
Quantity   
Main 45 (HE, APC, HVAP, Canister, Smoke) 
Secondary   
MG 800 
Side arms 
450
12
4 
Armor Thickness (mm)   
Hull Front, Upper 12 
Hull Front, Lower 12 
Hull Sides, Upper 12 
Hull Sides, Lower 12 
Hull Rear 12 
Hull Top 8 
Hull Bottom 7 
Turret Front 25 
Turret Sides 12 
Turret Rear 12 
Turret Top   
Engine (Make / Model) Continental R-975 C1 
Transmission 3 forward 1 reverse 
Capacity 165 gallons 
Performance   
Traverse 360° 
Max Speed 45-50 mph 
Cross Country 20 mph 
Road radius 150 miles 
Turning Radius   
Elevation Limits +19.5° to -10° 
Fording depth 4' 
Trench crossing 6' 2" 
Vertical Obstacle 3' 
Suspension (Type) Torsion bar 
Wheels each side 5 
Return rollers each side 4 
Track length   
Tires   
Track width 14.25" 
Track centers/tread 10' 10.25" 
Production Buick 7/43-10/44: 2,507 
