So, 2wks ago I towed my homemade 10x6 trailer and a Polaris Ranger 570 250 miles at about 65 to 70mph with my 94 bronco 5.8L(230k miles). The bronco is my daily driver(40 miles daily 5 days a week). The following day I was heading to work when I noticed the bronco was making a noise similar to what mud tires would make. If I let off the gas the sound almost goes away, but comes back as soon as I step on the gas again. Motor oil was changed out using all synthetic and tranny fluids are normal levels. Not sure what to make of the sound or it’s origin. Any tips would be greatly appreciated.