Adding big deck/ extra axle to a 5er. Carry 4 motorcycles.

FYI, I am going to add a second water tank to my trailer where I add the 12" beam under the stock beam.

The fresh water tank on my trailer is only 45 gallons. We go through that pretty fast if we have a lot of people are staying in the trailer.

I'm going to put the 2nd water tank pretty far forward. I'll fill it and use it as ballast to add hitch weight if it is too light.