SLC to San Diego to Tucson: route and camping advice?

[jnewberg02]

I'm making the trip from Logan UT (north of SLC) to San Diego then Tucson to sell for my business at bicycle swaps, leaving Nov 1st. The plan is to hit up vegas for some bike parts, then camp somewhere between vegas and San Diego. Head out of San diego the 5th or so, and have a few days to play around til the swap in Tucson on the 10th.

questions!

1. Where's a good spot for dispersed camping somewhere between vegas and San Diego? I'm willing to go a bit out of the way for something cool (hot springs? awesome views?) or just off I-15 for a quick secluded spot.

2. Any alternate routes from vegas to San Diego than straight down 15?

3. Anything worth seeing on the way to/in Tucson?

4. Good camping near and in Tucson?

Thanks in advance!