It is always better to do some exercise rather than totally skipping your workout. No room for excuses!
1) Checkout the Key Clubs such as Anytime Fitness, Snap Fitness, 24 Fitness, etc. They each have locations all over and one membership lets you access all locations. You walk in whenever you want.
2) Check your current fitness center/gym. Some while not franchises are members of organizations like IPFA or IHRSA that allow you to access other member gyms at little or usually no cost. Many times their own employees never mention it to members. You have to ask!
3) A limited number of Truck Stops now have fitness centers such as Travel Centers of America and Pilot. Check their websites for locations.
4) Public parks. Don’t expect weight machines or ellipticals but many now have stationary equipment to work different muscles groups. And Free access! Good place to bring family members if they are traveling with you.
5) The Hotel Room workout: Remember its about resistance and not weights. Resistance bands are one of the handiest and take up little luggage space. They can be used to work nearly every muscle group. If traveling by vehicle, consider a dumbell set. They range from inexpensive sets with separate plate weights (keep in the original box for traveling) to individual dumbells (if you do not need many) to the newer adjustable dumbells. May not be the exact or maximum weight you require but will help you maintain a level while away from your gym.
6) TRX Suspension Trainer is Lightweight at les than two pounds and versatile. Can be mounted to many places such as a motel room door or a tree at a park.
7) For cardio any time of movement from the motel swimming pool, walk around the block, running at parks or anything you can find at your location. It’s all good when it comes to cardio and keeping the heart pumping.