Google Maps on my mobile with HERE maps as an offline backup in the case of no network, Philips Truckers Atlas for bridge heights. Anything with weight limits or unsuitable for HGVs on isn’t guaranteed to be correct because unlike bridge heights there is no central database for either of those and I’ve often found Copilot Truck which we have as part of the Microlise system trying to route me up roads you most certainly can’t get a lorry down.
Also can’t beat asking drivers who’ve been there before because there are a lot of places where you need to approach from a certain direction otherwise you can’t get into it, usually because of how the car driving muppets on the industrial estate dump their cars.