The trailer/car combo is definitely out of your range, the tongue weight alone will be in the area of 900 pounds. As for the pickup, the tongue weight is fine as it is effectively zero. However, if you actually weigh your truck I think you will find that it weighs more than 5500 pounds. I would not be towing either of these outfits, your MH setup is not big enough. Now, it is possible that you are limited by the class 3 hitch and going to a class 4 or 5 will allow you to tow either of these units, but the only way to know for sure is to take the MH to a reputable hitch installer and have them look the MH over to see if there are other mitigating factors with the MH itself, if not the increased hitch rating will cure your problem.