Get your TWH then look for a saddle.  They are hard to fit if you are going to ride on long trail rides.  I have had many TWH and 5 Tuckers.  All of the Tuckers put hot spots on the shoulder area on all the TWH  I ride long and in the mountains.   That is harder on saddle fit I think.

Tuckers are the most comfortable and pretty saddles.  They just dont' work for me.  I have tried the montreal, equitation endurance, cheyenne oldtimer, and endurance.  My horses have been two year old slim models to aged fill out models. 

I ride now in a Bob Marshall treeless and have for 4 or 5 years.  I just bought a National Bridle TWH saddle.  It fits my aged gelding.  He is big bodied.  Just hold your horses until you find a great TWH for you. 

I have a great 4 year old graly for sale. 

Gaited horse trees have a bit more flare in the shoulder - it opens up the shoulder. But a special gaited tree is not the "be all and end-all" to all saddle-fitting issues. Brenda Imus makes a nice one that alot of folks rave about on her forums. Another quality maker is "About the Horse" who makes a variety of trees with rock, twist, flare, etc to fit most anything. I probably should have gotten one of the above named saddles. I have an Orthoflex that has been upgraded to the new Amera-Flex panels, but a wider tree would have been an ideal fit for my Foxtrotter. It is heavenly to ride in.

Hearsay is that Tuckers run narrow.

Get the new horse first, then get your saddle to fit him.

Also have registered and non registered TWH for sale.  I have a National Bridle Shop Tennesseean Supreme that fits my 13 year old gelding very well, and fits my 3 year old filly too.  For trail riding I am mostly using a Courbette endurance saddle with a 32 cm tree and modified cut back head.  If you are thinking about a field trial type saddle, imo the very best is the Jack Haggis, London, Ontario.  They will modify to suit you and your horse.  I had one which was customized for me and a horse that was a little narrow.  Sold it but would buy another Haggis if I wanted the trooper style.  I like the english type saddles because of the light weight and they come in all sorts of sizes to fit just about any horse.  If you have a minute you might want to look at gaitsofgold.com and showstoppertack.com and nationalbridle.com

Also please look at my site cloudfarms.com for photos of our horses. 

I rode in and liked the "Crates" endurance saddle. Real comfortable, western style without the horn. Out of the Tucker saddles, the new "River-Plantation" saddle looks real nice. Me, I like western style fenders. Thin narrower ones though. As seen on the new Tucker Plantation.  english leathers gave me scars on the insides of my legs from rubbing. Also look at stirrups, the endurance stirrups with thick rubber soles are real nice too-good for sore or bad knees. Be careful with the treeless saddles--Are you light-weight or heavy? A thing to consider. All your weight will be in one spot on your horses back. If you are light-they are o.k. Another nice saddle is the "Specialized saddles" The stirrup fenders on the western style are awesome. I had the" Montreal Trooper" made by Tucker, It has the same exact fender design as the "Specialized and I loved them! I have bad knees and never had knee pain on a ride with this fender design(I do long-distance) If you look at endurance saddles, you will most likely like what you see. They are made for comfort!

The Crates and others with referance to how they look and feel for you.What about how they FIT the horse.It seems with saddle fit the conversation even from lots of saddle makers is always about looks and how it fits the person.Not the animal.Thats one of the reasons  like talking to the folks at Crestridge was the stress they put on how it fits the HORSE and then its about style and seat for you.They do lots of mules(really hard to fit)and gaited horses.Maybe thats why they stress HORSE FIT so much.

From the photo the reason of rounded withers(if a purebred Walker) is she is extremely FAT! Most Walkers have very good withers.I'd take a LOT of weight off her before saddle buying.Is she a pure bred WALKER or a SSH.They have differant bodies.

I heard that Circle Y bought out Tucker.  I wonder if the quality has changed?  I prefer my older Ortho-flex saddles.  I feel the quality is superior to what I found with Tucker.  One saddle fits a variety of horses because of the flex panels.