For farts and giggles let's say your hitch weight is 1200 pounds (advertised at 688 rounded up top 700 and another 500 for "stuff"). Then add another 150 for hitch in truck and another 300 for people. Now you up to almost 1700 pounds so you need to subtract that from trucks cargo capacity. I don't know what 1/2 tons maxed out cargo is, but you'll have plenty in a 3/4. I agree with several replies on getting running boards over tube steps. GM with their independent front suspension will probly ride the best in either 2 or 4 wheel drive. Then again, I think Ford and Ram have IFS in their 2 wheel drive trucks. 4WD have their advanatges and disadvantages and will sit higher. Towing the 5er withe 3/4 will be a breeze and more stable.
****** Upon re-reading OP's question, I was assuming it was a 5er instead of a TT. In saying this, my math is prolly wrong on the hitch weight and cargo weight-------- if so, please correct me and I'm sorry if it was wrong*******
