I have a 2005 crew cab lariat with 70,000 miles on it. I noticed when pulling a load I have extremly high egt's I had 125 bales of hay on a trailer and the egt's loved to be at 1,000* & over. Now for these trucks this weight shouldnt be nothing to it. Now I am worried when I tow my 21ft enclosed snowmobile trailer that the gauge will be burried!! something else also is that I can statr pulling a hill at 70mph with 20psi of boost and when Iam at the top I am down to 10psi and 55mph!! Now when the truck was new it would pull the hills with the trailer and not loose any boost or speed if anything I would gain speed easily!!! With no trailer I the truck runs hot on egt;s and loves the 800*mark. Do I have an issue here. Thanks for your help!! Also I havent changed fuel filters since around 30,000 miles. Could the be getting bad?