Mine is closing in on 170000 . Make sure to keep the transmission fluid changed. The biggest issue I will have is the vehicle rusting due to life on a Vermont roads.
The transit will do fine when properly equipped with suitable tires . If you find one with posi-traction so much the better.
The 3.7 no turbo is adequate power. the biggest drawback with this engine is the timing chain driven water pump. It is very expensive to replace {1200-2500$}, sometime in 120000-160000 range. If neglected it will ruin the engine, The 3.5 Eco boost has a belt driven pump which is better but the High stress turbo charger setup has its own set of expensive issues.
If you are looking keep that in mind. The bigger the box the more fuel it takes to move it around.