I have a 2015 EcoDiesel 1500 Ram with a tow package. My husband and used it to tow a travel trailer on many extended trips. In our travels I only partially paid attention to how he balanced the hitch height for the trailer. He passed a couple years ago and I still want to travel with a travel trailer; so, now have a 16’ cargo trailer I have converted to a travel trailer. Trailer is aluminum frame and with the build estimate total weight under 3,000 lbs. (my husband took our other trailer to weight stations, he seem very concerned with tongue tow weight. I have not taken my conversion to be weighted) I have an adjustable height hitch and have adjusted the hight so on a flat parking lot the trailer and truck apear “level”. I have 40# in the air bags. The trailer pulls smooth - the truck does not “buck” when pulling the trailer. My Question: when pulling the trailer the tire pressure on the back tires runs about 2 lbs higher that when not pulling the trailer. Is this normal? If not, what should I do about it? I ask because I am beginning to take an extensive trip across several states, and as a single traveler, want to take all preventive measures for problems I can.