Jim,
I've had Rickson 19. 5's on my 2000 truck for several years and like them. Some comments:
I had hoped to get better fuel mileage and higher gearing from them. The gearing increased by only 4%. There was no noticeable change to fuel mileage. I installed a Superlift speedometer correction box that I bought from Rickson when I got the tires. It was expensive, but there are almost no other options.
I expected a rougher ride because of the additional unsprung weight. I haven't noticed any significant difference in the ride. My factory wheels were the 16" aluminum wheels.
The Rickson's were made for the earlier 2nd generation trucks. They fit my 1995. They have slightly less offset than the newer 2nd generation truck wheels should have. Therefore, on my 2000 truck they stick out farther than they should. This isn't as significant as I thought it might be, since the factory wheels had wider tires than the Rickson's. I had 245/70R19. 5 tires installed on the Ricksons. These are about as big as I can go without rubbing on something. They stick out about 1" farther than the factory tires did.
The Toyo tires didn't wear well. I intend to get a set of Michelins soon. I got about 60,000 miles out of the Toyos, but expected much more considering the design load for these tires. They aren't completely worn out yet, but will be soon. Although they are re-groovable, the cost of having them re-grooved makes this impractical.
My steel Rickson's have the big, stainless steel wheel covers. These are not easy to put on nor to take off. It's a pain to rotate the tires, so it doesn't get done often. (See above about tire wear. ) They do look great however.
I intend to sell these steel wheels and Toyo tires soon and replace them with Rickson's alloy wheels. His alloy wheels also have insufficient offset for the newer 2nd generation trucks, but I'll have the same setup I have now. The alloy wheels will eliminate the nuisance of the wheel covers. I need tires anyway, and if I can get close to $1000 for four wheels and four worn (but not worn out) tires, the new aluminum ones won't be that hard to buy.
All in all, I like my 19. 5's.
Loren