Dale, I have researched Miniature horse carts about as much as anybody, I imagine–and I have to say, I’m not sure all that you want is available in a cart that doesn’t cost over $1000…!
How tall is the mini you refer to, and of what build? That’s going to be a big factor, IMO. Your description of what you want best matches my Bennington, from England–but it costs considerably more than that(esp. when shipping is factored in!)-and is better for horses 34" and over, IMO.(I use it mostly on a 38" mare, though I have hooked it to one of my 34"ers once or twice.) It weighs @ 110 lbs. Bellcrown USA is an ‘easier entry’, well-made, costlier, weighs @ 105 lbs.; the Pacific ‘Smart Cart’ has gone up to over $2K in price(and in my mind, is still just a bit heavy for smaller minis-under 34", actually-it weighs around 115 lbs.) I don’t know about the details of the seat adjustment of the last two; the Benny does have seat adjustment w/o tools, has LOVELY balance and a WONDERFULLY comfortable and deep-enough, seat!
I also own a wooden Road Cart made by John Stoltzfus of Pequea Carriage Shop in PA(no website, but I do have a phone no., which I can send privately, if you want it.)The Road cart is very nice, rides nicely,seat adjusts w/o tools-but is not an ‘easy entry’.It also costs a deal over $1000. I have his brochures; I think he and/or his brother may build carts sold by Silver Penney Farm–and am pretty sure his brother builds the ones sold by Country Carriages–they appeal identical to mine built by John, but awhile back, cost a couple hundred more from Country Carriages…
I have read on other driving/mini forums that numerous people seem to like the kind of cart sold by Silver Penney(and as I said, made by one of the Stotzfus’, I believe.) They appear to be a basic EE cart,and have ‘pipe’ shaves, but w/ wooden basket and ?? elliptical springs(?-not sure of the proper terminology, but has elliptical springs that run parallel to the shafts and perpendicular to the seat). This causes the springs to ‘stick out’ behind the back of the cart, and that look doesn’t appeal to me, personally, so would not be my choice, but…? Don’t know other details about the construction, except that they ARE easy entry, they have high draft, and the same shallow seat that the less-expensive but very similar ‘all-pipe’ carts,like the Frontier(my choice of that type of cart, BTW) have. In the Pequea brochures there is also a little Meadowbrook ‘style’ wooden cart-not an EE, and(several years ago,so almost certainly higher now!), priced @ $850.My road cart does have a slightly deeper and more comfortable seat; all of the others from Pequea that I’ve referred to appear to have a similar, shallow(only around 11" ‘deep’, front to back!, and minimally padded–2" foam"; my Benny has 3" ultra dense, and WHAT a difference it makes! I think Bellcrown and Pacific also have similarly-padded, and somewhat deeper, seats), common in the ‘all-pipe’ and similar EE carts. Even the “Eazy Rider” carts, which have a hydraulic suspension, appear in other ways very similar to the less-expensive ‘all-pipe’ EE carts, and what appears to be a very similar shallow and 2" foam-padded, seat-and they are well over $1000, too. I don’t know about others, but the comfort of the seat REALLY makes a difference to me, esp. when driving for several hours!!
I am in the process of ordering a cart from Mike G. at IteBte; I am a ‘sucker’ for good equipment, and am after a lighter,overall ‘smaller’ ,yet maneuverable-in a way that my Frontier will NEVER BE!-cart for my smaller 32-34" driving horses, as I feel the Benny, as much as I like it, is still a bit large for them.)He began by building little 4-pneumatic-wheeled buggies(not my cup of tea at all!)-but he has ventured into marathon/all purpose metal carts, most similar to the Bellcrown. He is very willing to learn, and is trying some innovative ideas, and is also custom building according to customer desires. He told me he will be having to increase prices after the first of the year-and was already over $1K, though notably less expensive than the Benny, the Bellcrown, and the ‘Smart Cart’. A lady in WA state has recently announced the development of a super lightweight marathon-type metal cart for minis, w/ metal wheels, torsion suspension(I think!), and low draft–but in the one photo I’ve seen, it still has the shallow, minimally-padded seat–and is @ $1500, if memory serves! There are also several other overseas makers of carts, but most still appear not as light as you’d wish, and 'way more expensive than your stated price range…
Conclusion? It is STILL really hard to find the ‘ideal’ miniature cart or carriage! Things are ‘looking up’, for sure, but we aren’t ‘there’ yet, IMO!
My suggestion? That your best bet might be to look at the Pequea/Silver Penney carts, given the parameters you mentioned.
Good luck!
Margo in NM