We have the 4.10s on our 3/4 ton Chevy crewcab gasser and it does an adequate job pulling our TT TH around the Mountain West region. It's a dedicated tow vehicle and just sits in the garage until it's called to duty. The engine and tranny have synthetic oil and I have no problem running them in the 4-5K range as needed to achieve maximum power. Obviously a diesel is more ideal for toy hauler RVs but I couldn't convince my DW as she abhors them to no end. I agree that getting the more capable tranny gearing is the way to go.