The rubbermats.com suggestion is Linear Rubber Products. LRP have been around forever (although recently sold…) and have been my go-to for mats. They will prepare custom sizes and they are heavy, thick, strong mats. You will still need to do some fine tuning cuts to put them down, so expect that. They usually number them so you know how they go together. Nothing works better to cut them than a very sharp utility knife- buy extra blades!
Take care with your base, too… it’s really worth it to get the right material (we use what is called decomposed granite) then level it, laser level if you can or run a board from side to side to find and fill low spots, and then compact it. Rent a vibrating plate for an aisle= worth the rental. Dampen your base material too for best compaction. Don’t skimp on this preparation!
The mats have a bit of texture to them that provide good traction, but if they get wet any horse could possibly slip doing horse acrobatics. Much better traction than concrete though, and they keep the barns so much cleaner than dirt and are much easier to take care of.
I have tons of mats at my barn, including the aisles of 5 different barns, the largest aisle being 16 x 120’. We used Linear Rubber for all of them, and for about 50 sets of stall mats too. I bought the two-piece stall mats (2- 6 x 12’ per stall) which have been much better than using 6 of the 4 x 6’ mats… bigger mats have fingers to fit together down the middle (as do the aisle mats) and the big stall mats hardly shift at all.
Freight on mats can be shocking (ship from Wisconsin I think) but my considerable investment in these rubber mats has been an excellent long term investment. They should last just about forever.
I think Linear’s widest mat is 6’ so you probably will have to piece your aisle the short way. 7 pieces of rubber 6’ x 10’ long, with one piece having 2’ trimmed off the 10’ side. Even those mats will be very heavy to move around. A 10’ wide mat 40’ long, if you could ever find one, would be very (maybe impossibly) heavy to move with any kind of ordinary tractors/humans.