my question is, why not just get a diesel engine. you want to pull 30k lbs. i have a F450 4wd and have had a total combined weight of 34k lbs and pulled it for 60 miles. that made my truck work! that engine puts down 550 ft lbs torq and 225 or so hp. if you expect a 300 ci gas motor to do the same it will certainly live a short life. sorry for my bad opinion. i enjoy making our engines perform. but i think your plans are lofty.
but it would be fun to try. tom
