Creating a Trip along some Waypoints

Hi all,

i'am using a GPSMap 276CX and Basecamp and i'am on a very long trip on a Offroad RV.

So what i wan't to achieve is i want to plan a trip along some Waypoints for maybe 3000Miles.

I want to set my average speed for street-driving and for offroading - or i want to set the average speed for a type of road.

I wan't the trip planner to generate a trip along the WP's ending at the destination with a maximum time of daily driving.

So... Using the normal route planner, i'am able to create a route along the waypoints but i'am unable to split the route into day-parts.

The Trip Planner which should be made for that is even worse, it just creates a route from start to end with the shortest or fastest route but

i have no chance add mandatory waypoints.

Does anyone know how to achieve that? I'am Travelling for years and i have to plan long chunks of routes to say in time but it is not even possible to plan a trip for days.

I'am also open for route planning on the device itself or alternative software but the problem on alternative software is, they will create a generic GPX which is a track not a route,

so what i would have to do is converting each track to a garmin route which is quiet ugly.

Also using the route planner on the device itself supports showing distance and time between the waypoints but the distance is measured in direct line (unrouted) and the time uses this distance and therefore is completely wrong.

If anyone have some idea how to use my 800$ device for what it is made for, that would be so nice! :)

Cheers