My wife and I, with our dog and cat, are planning to take a year long trip around the US. We aren't sure which class of RV would be best for us. We are looking into buying used. Our dilema lies in the worry that with a Class C in order to get around easliy at our destinations we will have to tow another vehichle. What are the benfits and downfalls of each? Which would be the most economical?