I own one. The price seems fair, but that's quite a few hours. I paid $14k for mine 3 yrs ago with 2000 hrs.
The L35, and its successor the L39, is a smaller frame than the 45, 47, and 48.
The loader isn't really removable, and with its weight hanging off the front and the backhoe hanging off the back and with the short wheelbase, it hobby horses pretty good over bumps. The small front tires add to that. The tractor is heavy, 6000#, for its size and with those relatively small R4 tires, it's not a traction monster. Fortunately, I have a larger tractor for mowing.
You can get an SSQA adapter for about $1200, then you'll need a bucket or convert the old one. There's a thread on here by someone who converted his, that's probably what I'll do.
3PH - on these TLB's you have to install the lower arms and lift links after removing the hoe. The parts came with the L35 (not sure about the L39), but not the L4x's. But most of the time, the arms have been lost and will cost about $6-700. The 3PH doesn't strike me as the stoutest part of the machine. I'd limit it to a mid-weight 5' or light 6' brush cutter.
The GlideShift is a love-hate piece of design genius. It suits me fine, but the hydrostatic tranny on the newer models is probably better overall. The early models had an issue breaking the wet clutch drum, but one with 3000+ hours was probably a newer edition or has had the drum replaced. Like a hydro, you really don't want to tear into one.
All that said, it's a stout compact tractor. The TLB's are in the construction line with mini-excavators, etc. I think they're targeted at the light construction contractor.
I suspect one of your early remarks about broken axle housings was aimed at the JD 110TLB. I don't recall reading about a broken housing on a Kubota, especially one of the TLB's.
If it sounds like I'm trying to talk you out of this machine, it's because I don't have a good picture of what all you're wanting to do with a tractor. It's a great all around digger/hauler but not the best for other implements. If you have anymore questions about an L35, I'll try to help.