Utility Cycling - All-rounder wanted

I have various bikes in my stable. A fixed gear, a 650b tourer/pseudo-rando bike, a soon to be completed 1957 Malvern Star 3-speed and lastly a Surly 1x1.

The Surly has alternated between rigid singlespeed mtb (current set-up) and child-mover (topeak rack and seat, with slick tyres). As much as I love riding at the local trail i get the time to do it about twice per year. Subsequently, the Surly is much admired, but rarely utilised. As my family grows it's usefulness as a kid mover wanes. I'm planning to get a trailer, so think gears are in order.

So, here's my question. What I'd like is a bike that fits various functions, primarily child/grocery mover and occassional overnight camper, but that I could put on the dirt too without too much altering between functions.

My initial feeling is that a Surly Cross-check might fit the bill, but then also the Long Haul Trucker? I want a non-mtb type bike.

Any other suggestions?

Thanks

I'll post this in Cross section too.

Too bad you don't want an mtb type bike. If I could fit my Xtracycle on my 29er Monocog, I'd be in heaven. A monster-cross bike would be good, too, but I think I'd still choose my 29er monocog for my utility bike. I'd opt for some dirt drops, on a 29er frame with disc brakes. I like both your choices, as the cross check can handle a wider tire, but the the LHT can prevent heel-strike on the paniers.