I know this might sound a bit harsh so take the following with a grain of salt. Our trackloaders are stirctly backfill. If someone wants pipe, or a manhole, or sand, or stone or whatever... they can get the wheel loader to do it. I know this is not the optimum attitude to have but frankly I have enough to do during the day without worrying about other people needing crap. On a decent water and sewer job we are the most backed up machine on site for work, and frankly we probably move more dirt than the main hoe does because we get to move it up on the pile, blade it out, then backinto the hole and blade it out again.
Without forks... people don't ask you for things. Most of our crew doesn't know I can pick up a manhole barrel or cone... or slab top or pipe with my bucket, therefore when they need something and I am the only one around.... they go find the 966.
I do have to set barrels most of the time because the wheel loader either can't get into the ditch or they can't spare a hoe to come set them, which is cool it gives me practice on the fine tuning.
For backfill of wet material.... the track loader is king. Fan your piles out to get some air to them, and as you pull dry material from the top on the way into the ditch you can bring some wet in with it, fold it all in and its decent stuff. As well because you have to twist and turn on the material when its in the ditch you end up with a lift thats already half compacted and.... you won't find many dozer operators that can get a lift as flat and consistent as a track loader. As your spreading it out turn as much as possible it binds it all together makes it hard and then you just skin it off and its super flat. Even our best dozer hands end up with wavies in their lifts. I don't know one packer operator that prefers a dozer lift to one done by a 973.