New travel trailer - what is the best length

I have a 25' class TT... which is actually a 27' in real world terms. Some places I have been to have had a tight squeeze.
I have yet to stay at a National Park GC, But from what I hear (mainly on this site), anything longer than a 30' overall is beginning to limit your options. I am sure a fellow poster with more exp, can elaborate further for you.

If you do take a trip to Alaska, we expect some pictures of your trip posted for us to see. :-) Good luck and SAFE travels.

Not sure there is any best length for a trailer. I've had just as much fun in some of the smaller trailers 17 feet ad up, as I've had in my 34 footer. Not really much difference other than the ability to spread out. IN about 80,000 towing miles I've only been asked to leave one campground (after getting set up and ready to pay) and my preference is disburssed camping in NFS, BLM etc. areas. Most any size will work for nearly any situation.