WHDLoad works great, however depending on your Amiga and expansions installed you will need to change tooltypes.
For example if the tooltypes for game X were set to:
gamex.slave
PRELOAD
NOCACHE
...and it worked on your A1200 unit, that doesn't mean that it will work on your A3000T as well and you may have to change it to:
gamex.slave
PRELOAD
NOVBRMOVE
NOCACHE
NOAUTOVEC
...or remove all the NO tooltype lines altogether to make it work. You have to mix and match working tooltype lines sometimes to make a certain game work.