The tanks are the same on my 154bh. I have a 15 gallon blue tote and have used it a few times. Not my favorite thing, but it works.
Last weekend when the grey was almost full, I just opted to take Saturday night's shower in the shower house instead of the camper, since I was leaving and thus emptying the tanks in the morning. It didn't make sense to me to have to tote the water away for one shower.
I agree on the front stabilizers. They came on my last two pop ups, why not on a small tt?
Vent in bathroom a must too. Fortunately, it's an easy upgrade.
I'd like a 120 outlet in each bunk, instead of just the lower, and I'd like another 12v auto outlet on the kitchenette too.
Wouldn't want a smaller fresh tank, since we ran out of fresh water on our last outing. (Hand toted more to my site).
I don't feel your pain on cable/sat TV either. Strict rule against television on our camping trips!
But I'm a lot like you ... I see some shortcomings, but still LOVE the rv. It's a perfect fit for my family