I'm of the contrarian point of view on this tow issue. Typically, I am on vacation heading to one destination point so I don't need a tow vehicle because I either rent once I arrive or I have a vehicle available to me. Now, if you are going to travel and stop over a two week period or longer in multiple locations, then it makes sense to have a tow. Keep in mind you have to travel slower, can not back up, have to deal with watching after the tow while pulling it, and all the expense to purchase, maintain the vehicle, tow bar, brake system, brake & running lights.
Also, depending on weight, the tow will effect your mileage.