Rear Bumper Storage - how bad is it?

Seon wrote:
I added an aluminum tool box at the rear then added larger propane tanks, two batteries and a 2k generator up front to

Not afraid about the weight balance (I plan to add storage up front as well) or overall weight (we travel fairly light, plenty off weight 'room' to get to our 7500 lb trailer weight limit).

Obviously, under floor storage (near axle, or further to the front) would be ideal, but inconvenient (will add some 'shelf' down there for storing boards, battery relocation, spare tire and other stuff not often needed).

Only concerned about the increased sway tendency from the added mass so far away from center.

I added an aluminum tool box at the rear then added larger propane tanks, two batteries and a 2k generator up front to balance the weight.

We carry between 60 and 100 pounds on the cargo carrier. With 100#, we are at 13% on the tongue. No sway or any other issues.
The carrier is frame mounted. I wouldn’t trust the standard “bumper” to hold more than a spare tire.

When we had a TT (several actually), I always added a spare tire and bike rack. I could tell the difference, though not a huge one, when having 4 bikes back there vs. none. Never really towed w/o the spare.

I will note that in the front basement of our TT, near the hitch, I had a grill, hammock stand, all kinds of stuff...so with 4 bikes it did balance it out. So like you said, relocating items (my grill was originally stored in the back, but I moved to front) is a common fix.

As far as sway, we used a standard friction sway bar, and we had no issue. I think overall, in general terms, your initial set up is critical to an enjoyable tow. I'm talking 1st time with truck and trailer, loaded. I'm sure you know that. Personally, I'd be carefull adding too much weight back there.

BTW, our current Class C, I added a spare tire carrier and spare...the carrier alone was HEAVY -- solid steel -- to carry the 200lb (guestimate) spare tire. The carrier also allows me to still tow a car flat down or trailer. On the C, on a 450 chassis, I don't notice it at all. You probably experienced the same on a C...