I have an 95 F-150 it has 260,000 miles on it and I think it's getting tired. It seems to be having a problem pulling my 16' open trailer. The trailer is a 20 year old hand made heavy trailer. My question is, I need to replace the engine. Should I put another 302 in the truck, or convert to 351 or possibly a diesel. I do not want to get rid of the truck, it is in good shape. I will be using it solely for mowing trailer, posibly some light materials. (Mulch, dirt, ect...) I want the truck to pull this trailer without alot of strain on the engine/trans. I know there will be a degree of strain on any eingine. Any suggestions on what I should do.