I agree, if you have made your mind up on the size you want, go larger.... I kinda wish I had after getting mine. I looked at a LOT, and had I too am not fond of knocking the old head on roof ribs.... I found what I thought was the best.... went to look, and was not impressed with it. So the owner showed me around different makes, etc. The last one he showed me, was a 6 1/2 ft interior.... I had looked at these on line, and had read the specs compared to others. It was rock solid compared to the others he had on the lot as well. So, I bought it. I had made my mind up on a 6x12.... now looking back, I kinda wish I had gotten at least the 7ft wide, and maybe a couple of feet longer.... next time.
Anyway, do a lot of research, and don't jump too fast. Go and look different brands over, get the specs, then decide. Here is a thread for a post I made on mine, don't buy from them... they will NOT stand behind their warranty. It is a very well made trailer, I really like it, tows great, solid, just they do not stand behind their workmanship. DO NOT BUY A LARK UNITED trailer.
http://www.bbq-brethren.com/forum/showthread.php?t=56564
Just my 2 cents worth....
Bill