A sliding basket is a huge help in both dumping charcoal and in dumping ash. I only pull mine out to dump in the first batch of lit charcoal (then use sticks to feed it) and to dump the ash afterwords but it is a big help. I simply made my basket a half inch smaller than my door and put a piece of angle on both lower corners of the door to slide it in/out. No real work as the basket needs to sit up from the bottom of the firebox anyway.
While you are at it, a pull out ash pan Is a big help also...my clean out takes about 30 seconds and no ash means no rust!
The sliding basket is good convenience.. Not a deal breaker but You will be glad u put that in. Now the sliding ash pan... That's a deal breaker. Unless you just can't make it happen for some reason, you will regret not putting in if you don't. I wish I had one everytime I gotta clean the cooker.