Welcome to the fourms. I have a 300 2WD and they are as tough as a 4WD and mine does more than I ask it with ease. The two trailer photo's are from a few weeks back, and the 3rd one is from a few years back. Probably had 400-500 pounds of wood on that small trailer in the first photo. Hauled it down off the mountain. Point is if you take care of it and change your fluids AFTER BREAK IN use full synthetic oil, and I found some tuning on the carb helps wonders.
Keep the air filter clean and I found that an NGK Iridium DPR8EIX-9 plug goes along long long way. It's the premium plug and it does work.