Forgive the ignorance of a flatlander. Towing a TT yesterday up from the Mississippi River on I-90 in 90+ degree weather. 2500 Suburban 6.0 4.10 with 6 people and gear. Trailer is only 4600 empty, but we must have another 2000 in bikes, gear and tanks. So that's what, 13,000 combined? The grade had me at 3000RPM for like 20 minutes in 3rd gear, 60 MPH. Is 235 degrees what I should expect, or could there be benefit to a new fan clutch?