I’ll make a guess, your axle should say how many pounds it is rated for with a tag or stamped into the metal somewhere. Older trailers were built heavy. My 18’ dual axle if I remember right was 4,200 lbs dry. I’ll guess heavy at 4,000 lbs with full tanks. Most likely has a 3,500 pound axle under it and a 2,800 to 3,200 loaded capacity but manufactures lie and everyone adds stuff like hoses, batteries and etc. and no you cannot pull it with less than a V8 engine equipped with a trans cooler and repacked bearings with new tires properly inflated on the trailer. First mountain or windy day you will wish you had a 3/4 ton pickup! Take it to the truck stop and weigh it then let us know!