feel the need to chain down your tt ?

If I am worried about security, out come a pair of high test chains, each goes through the wheels on the side and through the suspension. I then use a high security padlock from Abus or another "Sold Secure Gold" brand. Then, just to show that the trailer is secured, I toss a trailer lock on the tongue, mainly to tell a would-be thief that the trailer isn't easy pickings.

If a thief is so desperate for a lab annex that they snap both locks and the tongue lock, that's what insurance is for. Generally, they will go look elsewhere for easier pickings.

Now, burglary of a rig... different story altogether.