I've seen the truck tire thing but I personally wouldn't recommend it. Truck tires are typically inflated to 45psi or so and are designed to provide a balance between traction in ice/snow, gas mileage, ride comfort, and long life. Trailers have different needs. Their wheels aren't powered, gas mileage isn't really important, and since they're used so much less, longevity isn't unimportant but it's less critical. And trailer suspensions are usually much less sophisticated so they get jolted harder.
My priority list for trailer tires is:
1. Sidewall strength
2. Durability
3. Cost
For brands I can't really recommend anything specific, I've used probably 7 different brands and they've actually all been fine. I just swapped my camper tires from Maxxis to Trailer King and I think they're both fine for those kinds of loads. What you really want to do is look at the ratings. Trailer tires don't have speed ratings, they're load/sidewall strengths, and they're at very specific pressures too.
My 8500lb RV has ST225/75's on it. As you can see those can hold 2500lbs each at 65psi. But this is where stuff can get dangerous fast. Throw an extra thousand pounds of cargo in that trailer and knock 10psi off if I don't check the inflation regularly and you can get in trouble real quick. I see lots of campers on the side of the road with shredded sidewalls and I bet you anything they didn't take a nail - they blew out from being overloaded, under-inflated, get a little too fast, and the sun was a little too hot... boom!