Raising Remove Trap "in the field"?

L5 treasure map chests

Aye. Thanks - maybe I'll ask if I can tag along on some L5 digs.

You can use Britain Warrior's Guild crates if you want to raise it on the field at the start. Usually shop crates which are locked are trapped as well, along with locked strongboxes at shops.

Best is to use RT + (between 15 and 20) = Tinker skill template until 70 RT. Then you can go with GM tinkered stuff until 95 easily. After 95 it was a pain to gain with tinker boxes and it's better to field it with L4 dungeon chests.

You can grind until GM with Level 4 dungeon chests but it will be slow ( I just did, but man poisoning skill is less grind to be honest). My first Level 6 defuse was at 96.8 and Level 7 defuse was at 97.6. So try to join high level treasure events after 95.