No idea! But no reason why not. The back wheels don't lift when you step off, and when knocking a post all the weight is transferred to the post so it shouln't rock too much. I use it on a 1.9t digger a lot and that handles it fine. Obviously it's not a full time fencer's rig, but for a hundred metres or so in a field behind a house it seems ideal- materials, knocker etc on the truck and the loader in a little 750kg trailer behind. Unload, use the pallet forks to carry the materials out and then fork the knocker off and attach. As you are right next to the controls even standing at the front positioning it should be a one man job, and then you have crowd on the tilt ram and sideways on the skid. It's one of those things that I already had, so might as well give it a go!
I also have one of these:
Atlas Copco LPDT Post Driver | Honda Engines and Generators | Gear GB
WWW.GEARGB.CO.UK
Atlas Copco LPDT Post Driver |Honda Engines and Generators | Gear GB
Which is exceptional value for money in my book and comes in handy for all sorts. Max post size is 4" (gotta be realistic) and it weighs 34kgs. Basically an exceptionally heavy duty man killer that you only need to lift once per post. I usually run it of a 30l/min powerpack but it was quite happy running off the micro at 20l/min so I've ordered some nice smooth 2.5m hoses to connect it to the Sherpa for these kind of jobs. I'll probably also splash out on a smaller auger motor now that I can share it between two machines- good to have optimised options. The Rammer 111 i bought recently is a beautiful breaker under the micro or the E10, or even the E19 for delicate work.
The only thing with the backplate I made is that it's not optimised for angles for various attachments. However, it does all reasonably well, and if I decide that some need a bit of angle then I will make up an angled spaced plate and use longer bolts, that seems the simplest way to share eveything optimally.