Everything I have seen so far has always been a crane stacking logs and trusses
We have done several log cabins in a resort near here. We set logs on 4 of them a few years back, and we did two this winter. And they built the other 20 or so cabins with only a telehandler to stack the logs.
The only cabins they have me lift logs for, are when there are trees surrounding the cabin, and they can't get close enough with the forklifts to set the logs. Two of them were on a slope/ cliff bluff, and too close to one another, that they couldn't get the telehandler where they needed to, and so had me set logs. But the telehandlers are on site from day one until they are finished. And they have me set logs for a day or two.
On the terex telehandler-
We've got a local contractor with two old terex/ square shooters. They are a simple tough old machine, I can't believe the abuse his machines have taken.
Like everything else terex- it was originally the "square shooter" company, terex bought them out, built them for a few years, and sold the line off to genie. In much the same way as in the cranes- they bought the old P&H/ lorain/ american crane lines- operated for a while, and then got out of it. Terex was kind of known for that in equipment lines- and I think its a crappy way to do business.
So you won't get any terex support for the machine, but its really not that complicated.