hi guys, we are finally taking the plunge and upgrading from our trusty canvas tent. Have finally decided on the 16.49-4 o/b for 2 adults and 3 ferrets (10,8 &7 and I will add we are all basketball players! ) we are having most extras added but am unsure whether to get fixed bunks or the buffet/Tri fold. Pros and cons please? And anything else we should know???