I have owned around 10 enclosed trailers and my must list is as follows:

5000 lb axles
escape door
long tongue
16" tires

I currently have a 32' LQ trailer, 12' LQ and 20' garage. Unfortunately I cannot put 16" tires on it do to being so low. I will be buying another 24' soon and it will have everything listed above. I still like the V-nose though for more room to tie the car down and keep the winch out of the way, plus you never know what you may buy at the strip...