For close proximity trail use the answer is yes. I have used the Cobra HH 38 WX ST on the trail with great results. It's a great unit that sends and receives quite well when the people you want to communicate with are close in proximity.
I purchased the hand held because I did not want to invest in a permanent mounted unit. I believed the handheld would fit my needs and allow me to communicate with my buddies when four wheeling. The unit worked but I soon realized that I really needed a more powerful unit that would allow me to talk with my friends while driving TO the trail. With the handheld unit I often found myself only being able to listen to the conversation rather then being a part of it.
Regardless, the handheld has been used quite extensively. It has been passed around to various friends that haven't purchased a permanent cb and performed quite well while on the trail. Driving on the highway leaves alot to be desired but for dedicated trail use it will do what you expect.
Those that the beast is looking for...
Listen in awe and you will hear him...
BARK AT THE MOON!