I think the Smart Cart is a lovely vehicle, but I stand by my opinion that, for a driver my size(I weigh around 180 lbs.)at least, it may well be too 'much' for an A sized mini. This is based on personal observation...a friend of mine bought a Smart Cart, used it here one time when we had a casual 'fun day' of obstacle driving, etc. in my arena -- which is both level and good footing- firm, but not 'hard'. Her horse was a 36" gelding of medium build;not 'highly' conditioned, but young and in good shape in every way. I both saw her drive and got to drive him myself. I noted that he was clearly having to put noticable effort into pulling the cart, even under these modest 'working' circumstances.I just can't see MOST A sized horses managing it on tough terrain or course(and with all due respect, I'd have to see for myself,a 29" horse handily pulling a Smart Cart, with even an 'average-sized' adult, to be convinced if that's a good idea.)
My Bennington weighs just at 110 lbs., it is fine for me with my 37" horse; the 'Missouri Flyer' I recently sold, fully outfitted, almost exactly the same(which is why I sold it; I'd wanted something NOTABLY lighter in weight but with the same features for my A horses, and despite reports to the builder(by another buyer) of a notably lighter weight, it didn't 'end up' that way)...it was a great cart, but I already owned one 'like it', as it turned out...the Benny...and didn't need two of essentially the same thing.
I am STILL 'on the hunt' for a cart with the features that I desire...wide steel (or aluminum) wheels, good suspension(whether it be torsion bars, half elliptical, or whatever), low draft, sturdy construction and finish, a DEEP (front to back;I LOVE the Benny's 17" deep, 3" 'thick' dense foam seat; find the GREATEST drawback to all of the 'pipe' EE carts I've seen, including Frontier, which I consider the 'best of the lot', to be the very shallow-most are 11-12" at best-and 'thin'--only 2" foam--seats; either a single seat or some 'set up' with a wedge and 'sides', to keep you 'in place' on fast manuevering, an easy entry feature, and a roomy 'basket', and marathon, or at the least, 'gooseneck, gig-type shafts. There are now several carts that I'm aware of 'out there' that come close...the newest model from Bellcrown, the newer Bennington(which is now pretty pricey to purchase, due to the drop in the value of the US dollar-and this before you consider shipping it from England!); even the PNW-originating "Scotsman"(except it has that shallow, thin, seat thing going on, best I can tell, yet IMO is kind of 'pricey'compared to its competitors)... I have recently begun to 'think about' a Hyperbike, purely due to its TRULY light weight, but...I don't really care for its WIDE wheelbase, nor how challenging it is to 'mount'(I'm old!), and am not at all sure I'd like the 'feet up all the time' driving position...so not sure I could/would 'go that route'...I still need to do --MORE RESEARCH!!
If I were lighter weight myself, my 'short list', for an 'all purpose' cart that would be fully suitable for CDEs, would include the Smart Cart ; for me personally, I'd look at the Bellcrown, and if I could scare up the money(!!) would also consider the 'new' Bennington for minis. The 'Missouri Flyer' is not being built(builder became ill, isn't building anymore, so I heard), or it would be included. Don't know if Russ Hardwick,the man who builds the 'Tadpole' pair vehicle, is building a two-wheeler for minis, but if he is, I'd look at it! All of the ones above that are currently being built have excellent reputations and experience behind them, and I think that is important. Seems there are new entries into the mini vehicle market all the time, nowadays, so there may well be some I've yet to hear about/discover...hope anyone who comes across any will share here!
(On the question about the wingback seat? From photos I've seen, it appeared that the Houghton might have the 'deepest' wingback. Of course, they went out of business; their assets were sold to Jerald...but used ones might occasionally come available. My friend who bought the Smart Cart sold that horse, then sold the SC, locally and quickly, for what she paid new, less her shipping cost.)
Margo...still in search of the 'perfect' cart! The Benny 'does it' for the larger mini, but I've yet to find what I'd REALLY like for the A sizes!