I think he's coming from my direction, and suggesting that CB is enough for most trail rides.
Kennith - pretty much so.
Any comm setup is better than none, and between CB and FRS - CB hands down for me (although I usually have one or two FRS walkie talkies in my trucks, as well as a handheld CB brick). I have now, and have had a CB in my trucks for about 15 years now - the much-maligned traffic on CB died down to a whisper. In the same time span, FRS handhelds became cheap as dirt and commonplace - and the combination of dead batteries, annoying random bleeps, people not being able to sort out CTCSS settings, and incessant clutter makes CB a great alternative. Besides that, the combination of FCC-limited power, radiation pattern of common mobile CB antennas, and receiver sensitivity is great for 1-5 mile range optimal for the trail ride.
A ham setup is a whole another level above CB rig, and possibilities are indeed endless - at the expense of the whole new level of complexity. Between a Yaesu dual-band mobile box, a Yaesu handheld and a Kenwood handheld - there's no way I could remember how to set them up properly and do it quickly. Before this year's Colorado trip, it took me about an hour to make sure both handhelds stayed put with the same settings - absolutely not something you would want to do while driving.
You also don't want to go cheap on the equipment - you can get a Baofeng dual-band handheld for 30-50 bucks, but you'll find the difference between that and a $180 Yaesu in a hurry.
Brett - LRNR doesn't require comms, so you may easily come to a run where the trail leader doesn't have a radio. I have.