I was towing my trailer loaded with about 16,000 pounds from Florida to New Mexico. on the hills my EGT would clime to 900/1000. But when I hit Dallas TX, my engine temp started following the high EGT. If the EGT went above 900, the engine temp started climing above 210 and the only reason it did not reach 260 was because I took my foot way out. I have 4in exht, bully dog progam in T/H, K&N cold air intake, and twin heavy duty electric fans from F/L. With no load I am now running between 600/700 on the highway. Thanks for any help.