The brake pad suggestion is brilliant and one many of us won't have thought off.
The black brake dust issue is almost negated if you wax your wheels and hose them off once a week.
Use real wheel wax not regular automotive body wax.
further, to make a smaller vehicle more tow friendly you can (over time and one by one if budget necessitates) have a shop add both a stand alone transmission and oil cooler to your vehicle.
Both increase your fluid capacity a bit and definitely increase your ability to shed heat on those long pulls.
I'd also ask you to ponder on replacing your brake fluid with silicone fluid. definitely more expensive but any normal driver in a non track prepped vehicle is not going to be able to boil it.
We camp/tear drop because we don't want to go 500 mph in an airplane or even 60 mph in an RV. I want to putter along, seeing things, stopping at neat stuff. So simply make sure that thought goes to your driving style. You aren't a zippy little in town vehicle any more, you are a tow unit and pulling at near manufacturer's limits.
Make sure your tires are properly inflated, make sure your struts/shocks are working properly, make sure your coolant is fresh and up to snuff, make sure every single thing you pack into the vehicle or tow behind it is needed, not just wanted. Every pound costs you either in fuel mileage or in wear and tear on stuff.