Even if you could get a class 3/4 your vehicle could not handle the weight.
Class I 2,000 WT Carrying, 200 Max Tongue WT
Class II 3,500 WT Carrying, 300 Max Tongue WT
Class III 6,000 WT Distributing, 600 Max Tongue WT, 3,500 WT Carrying, 300 Max Tongue Weight
Class IV 10,000 WT Distributing, 1,000 Max Tongue WT, 5,000 WT Carrying, 500 Max Tongue Weight
Class V Heavy Duty 12,000 WT Distributing, 1,200 Max Tongue WT, 8,000 WT Carrying, 800 Max Tongue Weight