To return to the original subject. The mod title has been corrected to reflect "Two Axle Trailer". Thanks, Heath.
The addition of the second axle has several advantages, but it does cost some $$. I'm quite happy with mine, and I recommend it.
I switched to disc brakes on the original axle and added them on the second axle at the same time. I recommend that as well.
The whole mod cost about $1250, plus maybe 15 hours of my labor.
You can still get many of the advantages of the second axle by simply adding one, retaining the original two wheel drum brakes, and skipping the solenoid lockout. You can save about $400 on the cost compared to what I paid. If you do so, you would do well to put the brakes on the rear axle as recommended by Champion.
At intermediate $$, you could also skip the switchover to disc brakes, retain the original drums, and add two drums to the new axle. Save $250 from what I paid. Note that the cost of brakes is just about $100 per wheel, whether drums or discs, while the cost of non braking hubs is $25 per wheel.
In any case, if you want to spread the cost out can put off any changes or additions to the brakes until a later time.
(Edit: Refined the economic analysis
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