Any new 5.2k axle with have a 6 lug pattern. You can find older mobile home stuff with a 5 on 5.5 pattern but I wouldn't advise it. Just a plain 3.5k beam is cheap. Less than $120 from a local shop I'm sure. To upgrade axles you almost have to two both plus tires and wheels all at once and gets $$$. But if you can, it would be the way to go.
I have a 7k Texas Bragg trailer, and one of my axles is bent. I pulled it out and it's obviously bent due to a big impact, (I won't lend it out any more). Can I replace it with a 5200 axle? It's got 5x5.5 drums on it if that makes any difference.
Thanks, and hope you'll come by the TK/TTF camp again at KOH.