what is widest separation they will handle-My tandems are 8 1/2" apart?

That full opened, it is 10 inch they will open. 8 1/2 inch would be at the max for them to have good holding power.

Is the x-chock wheel stabilizer lockable? that is, with a lock of some type?

Ours say Lockable with the optional 28015 Pad Lock - Which I have not located yet.

Does this work as good on tri axle trailers? Or do you have to use four of these to get the same results?

I Really don't think that you'll need 2 sets, I have put just 1 on one side of my tandem and WOW it locks it down! I think that just 1 set will do the trick! Happy Camping!

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Description

🔧 Lock in stability, unlock your peace of mind.

COMPACT POWERHOUSE - Slim design fits more axle applications without sacrificing strength or stability.
EFFORTLESS SETUP OPERATION - Includes a comfort-grip ratchet wrench for quick, tool-free installation and removal.
UNMATCHED AMERICAN DURABILITY - Crafted from zinc-coated steel to withstand harsh outdoor conditions and last for years.
PRECISION FIT FOR TANDEM TIRES - Adjusts seamlessly from 1-3/8" to 10" to stabilize even the narrowest wheel gaps on your RV or trailer.
ENHANCED SAFETY WITH LOCKABLE SECURITY - Supports optional padlock for peace of mind during storage or transit.

The X-Chock Wheel Stabilizer is a premium American-made wheel chock designed to secure tandem tires on RVs and trailers. Featuring rust-resistant zinc-coated steel, an adjustable fit from 1-3/8" to 10", and a lockable design with lifetime warranty, it offers durable, reliable stabilization and easy operation with an included ratchet wrench.

Specifications

Brand	BAL
Voltage	100 Volts
Recommended Uses For Product	securing trailers, RVs, or other vehicles with dual wheels during transportation or storage
Power Source	Manual
Special Feature	Portable, Lightweight
Included Components	BAL 28012 X-Chock Tire Locking Chock - Double
Item Weight	10 Pounds
Capacity	11.2 Pounds
Color	Chrome
Material	Alloy Steel
Product Dimensions	16"L x 7.5"W x 4.5"H
Style	Single
Model Name	28012
Hose Length	10 Inches
Manufacturer	BAL RV Products
UPC	702028280128
Global Trade Identification Number	00702028280128
Item Weight	10 pounds
Item model number	28012
Is Discontinued By Manufacturer	No
Manufacturer Part Number	28012
Special Features	Portable, Lightweight

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