Look up the key code for your 2003 Fleetwood travel trailer. Consult your owner's manual, if you have it. If you don't have the key code or owner's manual, order an owner's manual online from Fleetwood RV (you should have one anyway). Also call or email the company to ask about the code for your particular model.
Contact a locksmith and ask whether he has the replacement key blank for your key code. If he does, make an appointment to have the locksmith replace your key.
Order the replacement key blank from TriMark -- the supplier for Fleetwood travel trailer locks -- if a local locksmith does not have the key blanks you need. Then give it to the locksmith so he can rekey your lock.
