Can I replace my burned out headlight/headlamp?

You can do it yourself if you follow these instructions provided by Roger Bohnke. Travato-Headlight-Replacement

The marker lights over the cab get condensation inside. Where do I go to get this fixed?

The marker lights are part of the Ram Promaster Van and were installed by RAM.

You get them fixed or replaced at a RAM dealer (preferably a Ram Businesslink Dealer who sells and is experienced working on them.

Note:  This has been a known issue and TSB’s (Technical Service Bulletins) have been issued on it in the past.

(These are not a Winnebago installed item and Winnebago makes no changes to them.)