As far as I know, the 2.6 and 2.8 Trooper frame mounts are identical (as per an old post by Jerry I found here) so it wouldn't matter which truck you chose. I haven't seen the V6 engine brackets or rubber mounts, but it wouldn't matter as the diesel rubber mounts will work perfectly well and I doubt very much that the V6 engine brackets would line up with the diesel block.

I am not sure of the factory applications for the engine - I think it was 1988-91 (or 92?) boxy Troopers and some of the Rodeos and pickups. Truthfully, I'm not even sure how the model names correspond. I've seen what we call the Trooper called both the Bighorn and the Jackaroo. There's also a MU, which I think is our Rodeo...

I believe the 2.8 and 3.0 (maybe 3.1 too) share the same block, so the swap is much easier if the chassis is already set up for it as it is in the UK.

I don't think using an industrial unit would be appropriate for a passenger car, as they're not the same. Not certain of the exact differences - timing gears vs. belt being one - but the ones I've seen for sale aren't turbocharged and have the wrong bellhousing. Anyway, I got a much better deal than what I've seen industrial units go for on eBay.

Filters (oil is really the only one - the fuel finter is external so you can use what you want) shouldn't be a problem from what I've read, but the timing belts do have to come from overseas. About $65 shipped, good for 30k miles. Some parts should interchange with the industrial units, such as head gaskets and water pumps, so not all pieces will have to be sourced from afar, but it's not like finding bits for your GM unfortunately. You'd have to be prepared for this. But, C223 parts seem to be at least as hard to find, so it doesn't bother me much - yet ...