I love my Ricksons!
I put the 19. 5s on 80K miles ago, with the Goodyear Unisteels, like you see under a UPS truck, or one of the midsize schoolbusses. I'll probably hafta have'em regrooved by next summer, but, as for heat, I'm in Nevada, where the phrase, "but it's a dryyyy heat" can lead to a justifiable homicide. In the summer, on the hwy, I can run like hell and, if I pull over, I can put my hand right on the sidewall... no heat. No, not like a Conestoga wagon. More like a really big Porsche. My stock tires used to give a lot of sidewall wash at 70mph going around a sweeping 90* freeway curve, and even feel like an involuntary lane change in progress. These don't. With a different tire, that might be an issue, but, the Unisteels have steel belted construction from bead to bead, and just work really well on this truck.
As for storage on the spare (which has only been there for rotating, rather than flat-changes) my exhaust (when it was stock) used to rub, but after I changed to a front-of-tire short exhaust that was no longer an issue.
The tire/wheel are 120lb each. The little windlass is strong enough for lifting, but, I don't trust it to be the only hold, so a nice anchor was in order. the simplest need only be a hook made of allthread, and a big washer and nut.
The windlass also needed to be beefed up a bit. You know that hex-port where the jack handle mates up for cranking? It stretched out a bit and got round, and then wouldn't transfer torque. Solution? removed it, pounded a 1/2" squaredrive extension into it, and welded it solid, and then re-installed it. Now, when I want to lift or lower, I use a 1/2" breaker-bar and another extension (to clear the bumper) and it's smooooooth sailin!
I also had to cinch up the tire rearward to keep it from rubbing the diff cover. that was also pretty easy, once I committed myself to a 1/2" hole thru the sheetmetal under the tailgate (the nut and washer are unobtrusive between the bumper and the t-gate.
IN short, there'll be a few considerations, but, I consider them well worth the trouble. some of the mods wouldn't be a bad idea w/ stock tires, anyway, just for safety, if nothing else.
you might still be able to see my digital photos way back in the old files under "mag hytec, ricksons and the j-lo effect", if the photo server still works. .