I want to tow with my 05 lt equinox. So I installed a new hitch with no problem. Owners manual says I can tow up to 3500 lb. I hooked on to my cargo trailer that ways 2900lb. Took off with no problems. At 65 mph my rpm's are up around 3000. Will this be an issue on a four hour ride? Owners manual says if I have tow package this weight isn't an issue. What does the tow package consist of? Any help would be great. I don't want to kill the motor or transmission. Thanks in advance.