Rental house - I would enter a date of sale for all of the assets, but no sales price. That makes the depreciation stop and the asset go away the next year. Next year, delete the rental. This year claim part year taxes, interest and insurance on rental and on Schedule A, proportionally.

 Now - Motorhome - All PS assets should have ended up in Deductions > Depreciation. They don't want you to use 2106, but it is there as a tool. 2106 to schedule A, or C or E or ... allows for mileage rate to be taken and the right data to get to Sch C or E or ... and 4562.  The Depreciation has a section for "Auto & Additional Information" to get the mileage and expenses together for carrying to Schedule C, E, .....

You motorhome MUST be sitting at the side of the road in one of the two entry area - Depreciation or 2106. 

Depreciation Quick Entry is where I would start. If the listing is short and there is a description of the vehicle then VOILA!, she is found! I would be inclined to click the garbage can and get rid of it.

Not likely, but also look at Direct Input (4562) for something to delete.

2106 is a bit harder, Each tab should have a 1st entry for a word and a 2nd entry that links where the input goes.  There will be tabs with a tiny x in the upper right corner - Use this to DELETE any 2106 that remotely looks suspicious. It does allow for 2 vehicles, so if there  were 3 vehicles then that 3rd vehicle may be hiding in the wings, unseen. DELETE THAT 2106 and then create a new one. 

The software is quite foreign and there will be a steep learning curve, but it is dooable and there are some tricks to learn along the way.