F150 - Over GVWR

It's one thing to really overload a truck on a rare occasion and another to do it with some frequency. I wouldn't bat an eye to being a little overweight, but 300 lbs over is really over for a light duty truck. The GVWR for your vehicle is based on the weakest link. No one here can tell you what that weak link is with any certainty. People can tell you that I've done this or you'll be ok because of that, but they won't be with you on the side of the road or sitting with you at the dealer when something breaks. They definitely won't open their wallets to help you fix it either. If it's really going to be temporary, you might be better off waiting and buying the more capable truck and the larger trailer when you can afford to do so. It might be one of the hardest things to, but it might be for the best in the long run.