Usually it is good advice to start with the pros, but when deciding on an rv vs apartment most already know the potential benefits (which will be discussed later). The important thing, so you don't regret your decision, are the CONS:
You Need An RV: The initial investment of an rv can, for those considering rving short term or forced into it, scare them out of their decision. You do not and should never take out a loan to achieve this! We have only bought rvs to date that we can afford in cash. Keep searching ebay and craigslist a few times per day and you will find one in good working order, even if not sleek and shiny.
You Need An Affordable Place To Live: If your only option locally is a savvy rv park that charges $500++/month, you may have regrets if you have to stay in the area to commute to a job. For those who can work online (like us) you can search out the cheapest rv parks and travel to them, become a campground host where your rent is FREE or even enjoy free rent via boondocking with places such as Boondockers Welcome - Be My Guest RV Parking. For those who cannot leave the area, work hard to find the most affordable rv park in your area or advertise on craigslist to find land you can park on for a small rent (we did this last summer and had five acres to ourselves!). It really depends where you are at in the country. We stayed at an awesome rv park in the mountains of NW Montana, with all amenities included, for only $275/month! We've also been stuck in places that are $400 PLUS you pay utilities...very costly when running air conditioning or heaters full time.
There Is A Learning Curve: RVs are not like apartments in many ways. One of them is that you actually become a homeowner of sorts. You need to take time to learn about gray and black water tanks, how to empty a toilet (no, you don't flush and it magically disappears), propane, electric, stabilizing and leveling, winterizing if applicable and basically how the whole home on wheels functions. You won't simply "move in" and that's it. You have to be willing to learn the ins and outs of your recreational vehicle.
Space And Other Considerations: Even the biggest rvs are smaller than most apartments. You have to be willing to accept the limitations of living in a smaller dwelling full time. Also, we have an rv dog (she is big) and an rv cat (also big, haha). Our pets thrive in this rv lifestyle, but we are around all day and get them outdoors, exercise, etc. Don't crowd your pets into a small travel trailer and leave them there alone all day...they won't be happy campers.