I currently have a Huffy beach cruiser. I enjoy it for rides around town but interested in doing long trail rides is my cruiser sufficient or do I need something else ?

The body positioning on a cruiser is meant for just that, cruising. Not saying it can't be done, but you more than likely will not be that comfortable. Cruisers are built to tool around near the beach, go get an ice cream cone with your spouse or kids, stuff like that. What is your definition of a longer trail ride?

The bike itself will hold up. No worries there. The best thing might be for you to take it on some increasingly longer rides than you are currently doing. See how they go.

The limitation is not the bike, it's the rider
We Americans are so tuned into the hype that bombards us with myths regarding the 'correct' gear, clothes, components, etc etc etc.
Yes there is no doubt that having the perfect bike for every contingency is ideal. but we forget that millions of people around the world ride bicycles as there sole means of transportation. They do just fine using the same bike day in and day out putting many miles in on crappy roads and all kinds of whether.
We are so spoiled..........................................just sayin'

I do 20+ mile rides on my cruiser, on paved trails or roads. My wife does the same ride on her Jamis Citizen, which is probably somewhere between a cruiser and a touring bike, leaning a lot towards the cruiser side. We're both in our late 50s, so we're not trying to make the best times or impress anybody--- we just love riding. (Best thing I ever did was get her a bike for Mother's Day!) Still, we usually average 12-16 mph on these rides, on fairly heavy bikes, with her pacing. I have noticed that I average 5-8 mph higher speed on a lighter weight, though aged, road bike that is maybe12 lbs lighter . Still, my cruiser is like a pickup truck--- I take it everywhere and use it for everything, because it's tough and comfortable, even if it's not the fastest ride I own. ALL bikes are fun--- what kind of fun do you want to have?

Thankfully I am not in the position where a do it all single bike is my only means of transportation. I am afforded through hard work and long hours at work, the opportunity to have multiple bikes and a vehicle as well. Doing a long ride on a beach cruiser is fine for some people, but for me, I would rather have a more appropriate bike and the proper clothing to do it in. The ride becomes more enjoyable when I am comfortable. This means cycling shoes not flip flops. This means a jersey not a cotton t shirt. This means padded shorts not jeans.

Is it necessary? Nope. I could ride a beach cruiser on a century completely naked. Would I want to? No.

The beach cruiser is tough and simple so little to worry about maintenance wise, but if you got hills to climb, you might want some gears.

+1

yes you always need more bikes!! I have only 6 of them after scaling back some

My beach cruiser is a 7 speed Electra townie with fat tires - have gone on 30-40 km rides with; however not sure the saddle is optimal for longer tides.
Ps. The Townie's gearing for longer rides, while more effective than a single speed cruiser, could be improved. Stock gearing is the "mega range" cassette with a huge jump from 24 to 34 teeth- a cassette with teeth counts more evenly spaced over the range of cassette would be better.. In the 7 sod set up, a 40 t cassette and the 13-34 cassette would be more effective.

^This!

It also depends a lot on what you are used to. Start out slowly, gradually taking longer and longer rides (as opposed to just hopping on the bike and going out for a long ride immediately)- give your body time to acclimate and adapt, and you'll likely be fine and quite comfortable. Might not be the fastest guy out there...but sometimes it's fun to not be so fast, and to just enjoy the ride and scenery.