Options are
1. take them off the the last cross bar out and move it up 2 link and put back in and now you have more link to hook up to make it tight on the tire.
2. Due the chain tension that was already mention.
3. Get a quick link and use it to span 2-3 links of side chain and make it shorter. will have the side chain loose in that spot but it should not hurt anything.
Everbilt 3/8 in. Zinc-Plated Quick Link 43384 - The Home Depot
hope the quick link idea makes sense.
you can take the cross bars off just need a hammer and chiesel to spread apart the hooks put chain in a vise to hammer and chiesel the end hooks and then move it hammer it back closed or big channel lock pliers to squeeze them back shut or get a tire chain tool.
Free Same Day Shipping. 13" Truck SUV Tire Chains Repair Pliers Tool Truck and SUV Tire Chains Link Tool 7305 / 1390L
tirechain.com
I have this and have reworked a bunch of chains for ATV's and my John Deere 140.
Tool makes it alot easier to get hooks spread apart to take out and then to close them back up.