OK, I've read the "Axle Fact" sheet. I think I am ready to start hunting for a true 1-ton replacement axle for my 1983 18' Sunrader. I only have one question. The fact sheet says to use an axle made in 1987 or newer. Is the wheelbase the same on all of these axles thru all the model years? Or would I find myself carving out the wheel wells and adding fender flares. Not to mention the alignment of the suspension parts. Any help would be appreciated.