You may be entitled to recover damages from the individuals or groups responsible for the property either through their ownership or management. Even if you have a written lease and it attempts to place all responsibility upon the tenant, a roof collapse is an extraordinary event and unless you, by some action, caused the roof to fail, you should have a reasonable prospect for recovery. Obviously, you should have an attorney review the facts and give you an opinion on what would be involved with making demand upon the responsible party and pursuing a claim. You should be documenting all damages (getting estimates for repair of the vehicles), and if you have renters insurance you need to notify them immediately as well.
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It will depend first on what the lease says if there is a lease. Otherwise, you may have a claim, depending on further facts. If you had renter's insurance, you should contact them about making a claim. You may ultimately have to hire a lawyer.
This is not legal advice. You should always discuss the specifics of your issue in person with an attorney. Be aware that there are time limits on all claims that depend on the kind of claim, so do not delay in seeking an attorney.
The lease almost surely will not give you a remedy against the landlord or the management company. Landlords and management companies, not tenants, draft leases, so most of the duties are on the tenant and most of the rights are those of the landlord and/or management company. On the other hand, they have a common-law duty not to damage your property through their acts and omissions of negligence. The merits of your claim would, therefore, boil down to what they knew or should have known about the danger and whether or not they had a reasonable opportunity to eliminate it prior to the accident.
I suggest that you promptly consult an Arlington or Fort Worth lawyer about this.