We used a dolly for about 5 years and it is no way as difficult as some make it out to be. They are not that heavy to move around if you need to and if you take advantage of pull through sites you will rarely need to move it manually. After a little practice you can load the car yourself in about 10 minutes. Granted, it's not as easy a four down, but it works just fine. Also, if you buy a used dolly you can probably sell it in a few years for what you paid for it in the event you decide to go four down in the future. Good luck.
Lou
05 Travel Supreme Envoy