I have a highly satisfactory Wallenstein PTO driven BX42s
chipper driven by a Kubota B3300SU // 33-hp // 25-hp PTO tractor. B3300 tractor is an increment larger than yours and Wallenstein BX42s
chipper would be too large for your tractor.
Wallenstein makes their model BX32 for your size tractor. This is Wallenstein's smallest PTO drive
chipper and the only one which has a V-belt, which is used to increase the drive speed of the rotor on the BX32.
Wallenstein Canadian manufactured chippers are more money than a DR
chipper but they are much heavier duty. BX32 weighs 320 pounds. Chipping is heavy work. You want the heaviest duty implement you can afford to avoid frustration.
I bought my BX42s new, via eBay, from Iowa Farm Equipment. Iowa Farm Equipment has direct comparison of Wallenstein chippers to DR chippers on their web page.
I consider DR stuff in the "home use" category. A little delicate for my taste....although DR sells a lot of units in many categories.
One last comment: Wallenstein PTO chippers personify the KISS PRINCIPLE.
Keep It Simple, Stupid. Do you want to maintain a GAS engine on a stand along
chipper? Torque on a gas engine is NOTHING compared to torque on a diesel tractor engine. And torque is what turns your PTO...and
chipper rotor.