older non-metric Ford 3/4-ton and up wheels might work too.
be careful on the hub hole diameter. Aftermarket rims are most likely sized big to fit the largest hub. I know people swapping GM H2 wheels on dodges had to machine the hub hole a bit to fit them.
This.
Dodge, 2010 and older GM, and 1998 and older Ford all used 8x6.5" for their 8 lug trucks. MOST aftermarket wheels have a big enough center bore to fit all three, but as far as OEM wheels GM had a 4.56" center hole until 2001 when it went to 4.60". Dodge had a larger center with 4.76". Ford used a 4.9" center.
What would you all suggest to fill my wheel well more without a lift kit. I'd like to stay around a 265 or 285 tire....???? Would a 20" rim do the job?
Not sure what you mean by this. 265-285 is only the width of the tire. The wheel diameter is just that, it has no direct effect on tire height. You get the height using the tire section width and aspect ratio, then adding that to the wheel diameter to get the height.
What year/body style is the truck, and what look are you going for?
I don't know of any 265/XXR20 tires that would be a height you would want, and have the load range you need.
A 275/60R20 would be tall and narrow at 33"x10.8". This would be a little taller than the stock size application, this is what newer Fords and GMs with the stock 20" wheels come with.
A 285/55R20 would be about 32.3"x11"
A 305/55R20 would be about 33.2"x12" etc. Find out what size you can fit, then start looking around to find one you like.
Also keep in mind the width and offset of wheels you choose will have an effect on the size tires you can fit. You may be able to fit a 305/55R20 on a 20x8.5 with 5" of backspacing just fine, but put it on a 20x9 with 4.5" backspacing and you may be eating fender.
As far as stock sizes go, a stock 245/75R16 is only 30.4"x9.6" while a 265/75R16 would be 31.6"x10.4". 70 series sizes for a 17" wheel would be very close to those same sizes if it is a newer model with 17" wheels.