@KinkyWinksI have some research materials on my shelf, or boxed up for a move in 2023. If you want better than a swag.
Prudent folks had at least one spare wheel on their wagon, often three or more, a spare axel, and spare tongue.
Several of the trading post/forts, as well as a couple of towns where folks waited until spring had one or more blacksmith and/or wainwright (wagon maker) and a cooper (barrel maker).
Scavenging from a wagon that broke down happened. Theft of household goods was uncommon, as it was presumed the rightful owners would come back for personal stuff in a wagon. Discarded items on the side of the trail were another matter.
I have read a couple of examples of converting a damaged wagon to a Cart (two wheels) typically such an ad hoc transport would cary less than half of the original wagon. I don't believe that was very common. It required carpentry (Wainwright) skills not that many had.
On the other hand, necessity sometimes resulted in creativity.
Some folks, Mormons in particular using carts to begin with.
For short distances people juryrigged a skid, or even used a log (downhill only for a log).
TIME was the primary concern. Pioneers had to cross the Mountains (Rockies and Sierras, to get to California), Rockies for Utah, and Rockies and Cascades for Oregon and Washington.
There was a real balance of how much provisions (food), and wagon parts, and water (usually 72 hours or less) could be carried. Then there were your tools, plow, and household goods...
Even as early as the 1840s there were lists of what a family of 4 or 5 should have. Flour, rice, lard, sugar, salt, dried apples, dried beans, coffee, tea, butter churn, "dutch" oven, cast iron skillet, even collecting "Buffalo Chips" (dried shit) in a tarp slung under the wagon.
Lots of folks failed to heed the necessities... Lots of folks died too, sometimes even well prepared ones.
A Wagon Train of 20 to 25 wagons with at least a Competent Wagon Master (who had led wagon trains before) and at least 1 skilled Scout (and hunter) would be of great benefit.
Larger wagon trains tend to be an impediment. Too long to get going in the morning, too long to circle in the evenings. Crossing rivers, ridges, etc. would take too long too.
Of course, having 16 to 25 wagons allowed for doubling teams for steep grades, and other teamwork. Some essential gear could be pooled. Costs of the Wagon Master, Scout, couple be spread out. It might be possible for several folks to go hunting for a day or three, to provide meat for all.
I also have several books about Cattle Drives, and Chuck Wagons. Some drives had equipment wagons, etc.