Can't speak to winsor, but what I'd do is buy a used MTB with as many braze-ons as you can find. I recommend older trek steels (higher end ones, they have brand name tubing and were made in waterloo) as they're cheap, well made, and well designed. (I used to use an old 930).
You can find them in various condition. Look for one thats been well treated and ether had upgraded wheels or cheap enough to afford new ones. There's something of a cult surrounding old Trek steel MTBs, so if you find one in good coindition, odds are it has upgraded compontents.
Granted, as I type this I realize that these bikes are now long in the tooth and not easy to find in good shape, so better advice would be to look for a used tourer. I've seen aq number of 520 on ebay for lowish prices. Note that most people buy em for communting so they don't have as much stress on em as you'd think.
Or you could just go with any decent MTb and a trailer. Granted BOB's aren't cheap, but it would give you flexibility.