I've been an avid surf fisherman for many years, conventional and fly (but not Tenkara).
I think success in the surf with a tenkara would depend greatly on tides, location, etc., etc. Sometimes having the ability to cast further than 30' is pretty critical...but again, depending on the situation.
My favorite surf setup is a St. Croix Wild River 8 1/2' steelhead rod (8-15 lb., 8'+ length is great for casting), a Shimano Sedona reel (somewhat cheap- I'm done with expensive reels in the surf; too much salt and sand) with light line (~8 # on the reel, ~6# leaders). I fish a Carolina rig (sliding egg sinker, swivel, #4 or 6 Owner Mosquito hooks). I usually use grubs, artificial worms (Gulp camo sandworms are amazing everywhere I've fished them) or I dig sandcrabs.
I've never weighed it, but it's a pretty light setup for surf. I'm wagering I could have a good kit for less than 1 1/2 lbs. Not quite UL, but very productive and easy to use.
I'm dying to walk the Lost Coast with this gear...