Kudos to you for seeking input for this unusual configuration. In all honestly you're not going to like the feedback as what you're suggesting is so clearly unrealistic and unsafe that many will want to blast you for it.
That said; a 2007 explorer is:
- A very short wheelbase to realistically tow a lengthy trailer and not encounter sway.
- A very lightweight platform to manage the heavy load incurred from "properly configured" tongue weight.
- Does not have the proper payload capacity (rear axle, springs, tires, wheels, frame) to support the "properly configured" tongue weight.
- Is insufficiently equipped in the power and cooling department to realistically manage a heavy load over long range and/or high speeds. Think transmission or engine oil temps while pulling a grade on the highway.
- From the factory, is not configured with the proper electronic brake controller configuration required to pull an enclosed travel trailer (these things don't have surge brakes).
These are just the obvious ones. The recommendation to load the trailer rear heavy in order to counter proper tongue weight is ridiculous. That is an extremely dangerous suggestion and one that quite frankly could cost you or your family their lives (not to mention put others around you at risk).