The best way I have found for the converter to lock is, before starting up a hill, shift down and ease the throtle to mantain current speed and hold and watch the tach, after a couple seconds should see it drop the '200' RPM and then you can step on the throtle and power up the hill without creating tons of heat.
Just because you have a auto trans, you still need to shift once and a while, but you always need to know what the trans is doing, watch/pay attention to what the vehical is doing while towing, you will learn in a hurry.
Hope this helps.
'01 F350 PSD 4X4 CC LB SRW, firestone air bags, bilstien shocks, superchips 60hp, 4" cat back exhaust, front end leveling kit, aux trans cooler
'00 315 wanderer, Honda EU2000