I have a 12 aspect by winnebago (28ft). its approx 12700 lightly loaded. We dont carry much for weight less than 1/2 tank water, dump grey and black when they indicate more than 1/3 full. Pull a hyundai elantra. run 75psi in rears, 60-65 in air bags, 65-70 in front tires and the air in the bags makes a big difference imo. too little it will wallow in winds and when being pushed by bow wave on semis and busses. found the sweet spot about 60 in the bags. Just need to play with the settings and TPs remember that is for MAX weight at 80psi