We have a laptop computer table from Ikea that is great for RV'ers.  Ikea named it "Dave";) 
Just go to Ikea.com and search for computer tables.

I will have to look at one of these at an Ikea store but I suspect it is not what I want. We don't need a computer setup while we are parked, but would like one while driving our motorhome with the GPS attached. But not enough to cough up the money for a Jotto Desk floor mount . It looks like "DAVE" is not sturdy enough to be clamped down while driving.

Since I ended up with an RV without a dinette, which would have been my office, I've been looking at those rolling carts that have flip-up extensions and some drawer space. I've found several from $100-$200, just wish I could find one in a store rather than having to have it shipped....and have to put it together, too. <g>

I have a great laptop laptop tray - wide enough for my mouse, generous padding, sits well on my lap. That is what I have been using for the last month or two at home. But I need a place for my printer, bills, etc.

We both use laptops with the padded trays, they are very comfortable. I even use the tray by itself for eating dinner, very handy item. Fred

Bill, I don't think this would work for the truck. It only has two positions for tilting and the stand looks too large. It's great for inside the RV though.