I too have gotten the total blow-off from RCV. I was interested in running some of their Dana 44 shafts (with the same CV-joints you guys are talking about). After 3 or 4 e-mails and also leaving my phone number...I gave up. Hell...I was sitting here with my VISA card and all they had to do was pick up the damn phone to get my $1200!!!
Yukon ended up getting it.
And yes I did carry a spare front axle (the center, not the half-shafts). There is nothing big or heavy about it....probably 80lbs & 3-feet long. Almost the same size & weight as two half-shafts. Don't confuse the H3 axle with something from a Jeep...its half the size.