We have designed many touring frames with 145 mm rear spacing to use tandem hubs which enables us to build 0 dish rear wheels... this should almost become a standard on new geared bikes as it offers the simplest solution when it comes to making a wheel stronger.

We also offer a 165mm hub but that is a completely different beast...

I'd look at the Mavic 719 as a replacement as it is a rim I have built up many many times for touring bikes and to date their failure rate has been zero... and do follow FB's advice on tyre pressure and wider tyres as this is important info to have.

The Salsa Gordo has also proven itself to be a very good to excellent rim.

The reason many wider tyres have lower psi ratings is not because they cannot handle higher psi but that the higher psi can overwhelm a rim's structural capacity... you really do not want your sidewalls cracking and splitting on you as the consequences can be pretty nasty if it happens while you are rolling.