OK. Your in El Paso, TX. 100dollarman has everything from 395's down. Whatever you want for your deuce. He has bigger but the 395 is as big as you can go without the tandems touching. He is in Lucerne Valley, CA. I am near Denver, CO and took a vaccation to Las Vegas when I got my tires from him. He is about 2 hours from Vegas.
395's will fit on stock rims. They take a bit of wrangling to get the lock ring back on the rim but not really too bad. I used a 30 gallon drum and two friends to help get them mounted.
Set the rim over the drum. Put the tire on the rim. use a hoist or chainfall to pull tire bead up from rim. Clean inside of tire. No rocks or debris. Sling baby powder all over the inside of the tire. Rub baby powder all over tube and liner. Insert tube and liner. Insert valve stem into liner hole and then through rim. Make sure tube is not pinched under liner and is not twisted. Set lock ring onto tire bead with slot 180 degrees away from valve stem. Have friend pry down the ring with a breaker bar at the 11 o'clock position from the slot through cooler holes in the rim. Have other friend stabilize wheel with another breaker bar on the opposite side through cooler holes. Work ring down with prybars going counter clockwise from slot until seated. Remove valve stem core. Inflate tube to 10 lbs. Let it deflate. Inflate to 20 lbs. Let it deflate. Reinstall valve stem core. Inflate tire to desired pressure. I run my 395's at 65 lbs. Watch lock ring to make sure it is seated properly and that the tire bead is all the way seated while inflating. For safety you can wrap a chain through the cooler holes in the rim around the tire. That way if the ring lets loose for some reason it has something to retain it.
I will put up some pictures.
If you have to you can run the 9.00 X 20 tubes in the 395's if they are in good shape. I did and have a couple go bad but it took about a year. But......Do you really want to dismount the tires just to put tubes back in them if they go bad in a week? So 11.00-13.80 R tubes cost me $25 each. 14.00 R tubes cost me $35 each. You do the math and make your own choice.
As for performance. I can get 65 MPH out of the truck now. It sniff's a hill and I am downshifting but I also live at 6000 ft. Off road it is great. I air down to 15 and it rides real smooth. Great traction too.
100dollarman is on SS. He can hook you up with a set of tires.