For $1400 I would try to find a used Rotohoe or Kemp Model 8, the forerunners to this model, I have owned both:
Merry Mac Tow-Behind Wood Chipper/Shredder — 249cc Briggs & Stratton 1150 Series OHV Engine, 3 1/2in. Chipping Capacity, Model# 12PT1100M
https://www.northerntool.com/shop/tools/product_8253_8253
Try to find the one with a drum and "fingers" and not the flails. The flails tend to jam, a clutch is needed to make any real use of the shredder, which many have.
I bought a used SC-183 with a 22 HP Predator engine on it and fixed it up a bit. Now that devours 4" branches and shreds 1.5" stuff like no tomorrow.
https://www.mackissicchippers.com/hitochsh.html
In the 2nd picture, see that stump in the background, behind the trash cans? It chipped the branches from that large pine tree and another two smaller fir type trees, and some bushes in about 6 hours of flat out running. It is about 3x a chipper of the MerryMac ones (which I like a lot), and the MerryMac types (older versions) are about 2-3x the chipper then that Dr. Power one will be. Yes, I have had people, such as a climber, break the "shredder" like the Dr. Power by dropping in a big branch that should have been chipped. Snapped the flail shaft in 1/2. None of them, including the SC-183, come close to a 6" Veermer with hydraulic feed or a 9" Bearcat.
If you can wait, try buying a used chipper in November or December, that is when you can get a good deal, though I bought mine in the spring and drove something close to 200 to pick my used one up, it was a very fortunate find.