Just FYI, it took a pair of 4" spacers behind my R4s to achieve the rear track you have right now. Too bad the bolt pattern isn't the same, you'd appreciate a pair of 2" spacers up front. I've got 2.5" spacers on my R4 fronts, which makes the front tire spacing exactly the same as the width of my 4-in-1 bucket.I have my R1s set at the widest point and although my 3320 has a high work station, it does not feel tippy and I live in WV. I planned on getting r4's and have a set of 2"'spacers that I'll never use. If anyone is interested I'll sell the set for $200.
Well 300 hours isn't enough test to prove it one way or the other. We'll have to check back with you have 2000 hours on it.My selling dealer refused to put spacers on the 3x20 series, saying the axle housings/bearings were not sturdy enough. His priority was liability, mine was operator safety. Plus I didn't want to have to buy a new cab if I rolled it. So I went aftermarket for spacers. In 4 years it's logged >300 hours, zero problems relative to the aftermarket spacers. No more of those butt-puckering 3 wheel stands either.