I'm new to power stroke diesels and I'm looking to buy an Excursion to tow an 8-10,000 pound travel trailer (depending on load). I found a well maintained 2003 XLT 7.3L with no rust that doesn't leak for $7,000, but it has 340,000 mostly highway miles, minimal towing. Another option is a 2003 Limited Edition 7.3L with 170,000 miles for $17,000. Both look well cared for. Which one would you buy and why? And what should I look for/ask about when inspecting the vehicles? Thanks in advance. Tim.