I have the same unit as you. So far have noticed no handling problems. I use recommended tire pressures as indicated on the door pillar.
On the sofa, the water tank and pump are there. I don't see any way to relocate either.
A few mods I've done are to replace the anemic excuse for a bathroom fan with a Vortex fan. Very simple mod to do. I've done it in my fifth wheel and previous motor home as well.
I also installed a 32" smart tv in the bedroom, it's pre-wired, so easy to do. Mounts on the cabinet door so you can just flip it up to get to storage.
I built and installed a shelf in the cabinets over the sofa.
I built a sink cover for one side of the double sink. Very little counter space in this unit. I found a really neat stove cover, ordered from Amazon. Pricey, ($46) but it is a perfect fit and stays put. Camco 43704 Decor Mate Stove Topper (Black). Not metal so no rattles.
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