I think the burned oil may be your red herring. It sounds like you put the jeep under a ton more stress than its used to by dragging all that trailer weight up the mountains. The first thing you should look for are holes blown into the exhaust, rattling cat, and especially a rattling heat shield. Tap the catalytic converter and catalytic converter heat shield with a screw driver to see if they make noise, and run your hands all over the COLD exhaust pipes from the engines all the way to tailpipe.
I'm guessing you just burn a bit of oil anyway, and burned an unusually large amount compared to normal under the high load.