Hi Ronahue!
Dane has already offered you great advice on the brake lines and cable ties. We came down the Alcan and then down the Cassiar entering the Lower 48 near Seattle in late summer. Our cable ties holding the electric brake wires against the "leeside" of the axle got showered with sharp rocks during an extended construction zone. They broke and then let the electric lines droop down to a more vulnerable position, where they eventually became severed at the connectors right on the backside of the trailer wheels. It was a $50 repair, but a great step to avoid this is to add very thick black heavy cable ties next to the factory ones just like Dane said, so this won't happen, and monitor their condition after gravel stretches. This was our only issue.
The provincial campgrounds all through the Yukon Territories are especially great. They were positioned near streams and lakes of exceptional beauty. They were stocked with free firewood, the campsites were roomy, clean, privacy separated and well-maintained, and most even had paperback book "exchange" boxes at the firewood / water stations. The CG personnel are always really nice and were always careful to accurately adjust US currency to Canadian, due to the approx. 83 cents CDN value of US dollars back then. Campground fees could often be as low as $12 per night. One site had berry picking galore right alongside our R-pod. We loved this boondocking period of the YT stretches the best, tho the BC campgrounds were also great.
You will have a blast on this trip (to borrow Leo's great expression). Don't have high expectations for mile distances on a daily basis. You will get further down the road then expected some days, and not be as productive on other days. Although largely the distances are paved, there are many pavement breaks and frost heaves that are most often flagged. Mountain passes and switchbacks also affect the speed of your progress, as you would guess. Always always slow down to protect your suspension for perceived bumps, and use all of the road when available, to pick the best line through rough patches. It's easy to get relaxed and expect L48 road conditions, and then be surprised that a dip and a bump wants to rearrange all your groceries and possessions in one kaboom. We always popped into our R-Pod at breaks to observe how things stayed in place (or not) en route. One thing that we brought that was really handy was a bottle of Goo-Gone, so that I could clean off tar splatters on the lower R-Pod cladding from a construction stretch. That way, we didn't have to live with sun-hardened tar spots for most of a month. (Or is this just an indication of my being an R-Pod helicopter parent??? !!!)
Bring a more robust selection of camping repair / road tools than you might otherwise. Eg: a rugged non-adjustable wrench of size to tighten your hitch ball, and hitch assembly; dialectric grease for your hitch ball, (to maintain the electrical ground there for your brakes & lighting, I was informed). Consider Fix-A-Flat cans and a strong little 12V air compressor, though we had no tire issues. Our R-Pod tires wore very well on this trip. Best that you have LT rather than "P" (Passenger) tires if your TV allows for that clearance. In your preparations, become a little more of a "proactive packrat" as you'll never know what kind of little odd repair operation will make things operate smoothly with the tools & supplies you bring with you.
Fuel is big. We carried two 5-gal fuel jugs tightly cinched down on outrigger wooden platforms I fashioned side-saddle style to the crossbars that also supported our handy metal Yakima rooftop basket carrier. I also added an auxiliary cross-bed re-fueling tank to the Tundra, but that may be not reasonable for you. Whatever creative & safe ways you find to take extra fuel cell(s) down the road, the peace of mind of being able soak in the beauty and excitement of this trip without sweating over your "low fuel" dash light will help make the trip less concerning. We were careful to keep "BG" consistently in TOW/HAUL mode to lessen transmission wear. Be sure to consistently lock out your overdrive in your particular tow vehicle if applicable for acceleration while the fuel tanks are full or to pull grades up through passes. Fuel weighs approx. 7 pounds per gallon (plus the fullness of your fresh water load), propane, etc. so give your TV the best advantage for its transmission until more of your fuel gets burned off at least.
And please prepare your cell phone provider to allow Canadian acess, (and how to use them once set up rather than get shocked by charges). Prepare your credit card companies to allow you unfettered use in Canada. (Many forget this!) It's ugly to have them become inactive to you for a needed charge in Canada.
We had so much fun on this trip, so don't let all these nitty gritty precautions discourage this "trip of a lifetime". Feel free to ask any of us out there any small or big or seemingly obvious question and collectively we can make your trip much more fun by putting you in the "aware and prepared" category.
My wife is a smart bunny when it comes to food preparation adjustments and "thinking ahead" saavyness related to avoiding hassels and increasing the efficiency of what we spent. I owe her so much for her valuable co-captain skills, sense of humor and proactive ideas that made this great north adventure one to now smile about. Time to stop. Your eyes may have already glazed over !
Brad & Layli
R-Pod 179
Towed by "BG" the 2010 Tundra